1. 11 4月, 2015 2 次提交
  2. 09 4月, 2015 8 次提交
  3. 08 4月, 2015 5 次提交
    • D
      x86/asm/entry/64: Add forgotten CFI annotation · 8b3607b5
      Denys Vlasenko 提交于
      Signed-off-by: NDenys Vlasenko <dvlasenk@redhat.com>
      Cc: Alexei Starovoitov <ast@plumgrid.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Will Drewry <wad@chromium.org>
      Link: http://lkml.kernel.org/r/1428424967-14460-1-git-send-email-dvlasenk@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      8b3607b5
    • D
      x86/asm/entry/irq: Simplify interrupt dispatch table (IDT) layout · 3304c9c3
      Denys Vlasenko 提交于
      Interrupt entry points are handled with the following code,
      each 32-byte code block contains seven entry points:
      
      		...
      		[push][jump 22] // 4 bytes
      		[push][jump 18] // 4 bytes
      		[push][jump 14] // 4 bytes
      		[push][jump 10] // 4 bytes
      		[push][jump  6] // 4 bytes
      		[push][jump  2] // 4 bytes
      		[push][jump common_interrupt][padding] // 8 bytes
      
      		[push][jump]
      		[push][jump]
      		[push][jump]
      		[push][jump]
      		[push][jump]
      		[push][jump]
      		[push][jump common_interrupt][padding]
      
      		[padding_2]
      	common_interrupt:
      
      And there is a table which holds pointers to every entry point,
      IOW: to every push.
      
      In cold cache, two jumps are still costlier than one, even
      though we get the benefit of them residing in the same
      cacheline.
      
      This change replaces short jumps with near ones to
      'common_interrupt', and pads every push+jump pair to 8 bytes. This
      way, each interrupt takes only one jump.
      
      This change replaces ".p2align CONFIG_X86_L1_CACHE_SHIFT" before
      dispatch table with ".align 8" - we do not need anything
      stronger than that.
      
      The table of entry addresses (the interrupt[] array) is no
      longer necessary, the address of entries can be easily
      calculated as (irq_entries_start + i*8).
      
         text	   data	    bss	    dec	    hex	filename
        12546	      0	      0	  12546	   3102	entry_64.o.before
        11626	      0	      0	  11626	   2d6a	entry_64.o
      
      The size decrease is because 1656 bytes of .init.rodata are
      gone. That's initdata, though. The resident size does go up a
      bit.
      
      Run-tested (32 and 64 bits).
      Acked-and-Tested-by: NBorislav Petkov <bp@suse.de>
      Signed-off-by: NDenys Vlasenko <dvlasenk@redhat.com>
      Cc: Alexei Starovoitov <ast@plumgrid.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Will Drewry <wad@chromium.org>
      Link: http://lkml.kernel.org/r/1428090553-7283-1-git-send-email-dvlasenk@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      3304c9c3
    • D
      x86/asm/entry/64: Move opportunistic sysret code to syscall code path · fffbb5dc
      Denys Vlasenko 提交于
      This change does two things:
      
      Copy-pastes "retint_swapgs:" code into syscall handling code,
      the copy is under "syscall_return:" label. The code is unchanged
      apart from some label renames.
      
      Removes "opportunistic sysret" code from "retint_swapgs:" code
      block, since now it won't be reached by syscall return. This in
      fact removes most of the code in question.
      
         text	   data	    bss	    dec	    hex	filename
        12530	      0	      0	  12530	   30f2	entry_64.o.before
        12562	      0	      0	  12562	   3112	entry_64.o
      
      Run-tested.
      Acked-and-Tested-by: NBorislav Petkov <bp@suse.de>
      Signed-off-by: NDenys Vlasenko <dvlasenk@redhat.com>
      Cc: Alexei Starovoitov <ast@plumgrid.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Will Drewry <wad@chromium.org>
      Link: http://lkml.kernel.org/r/1427993219-7291-1-git-send-email-dvlasenk@redhat.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      fffbb5dc
    • I
      Merge tag 'v4.0-rc7' into x86/asm, to resolve conflicts · 4bcc7827
      Ingo Molnar 提交于
      Conflicts:
      	arch/x86/kernel/entry_64.S
      Signed-off-by: NIngo Molnar <mingo@kernel.org>
      4bcc7827
    • A
      x86, selftests: Add sigreturn selftest · 3f705dfd
      Andy Lutomirski 提交于
      This is my sigreturn test, added mostly unchanged from its old
      home. It exercises the sigreturn(2) syscall, specifically
      focusing on its interactions with various IRET corner cases.
      
      It tests for correct behavior in several areas that were
      historically dangerously buggy. For example, it exercises espfix
      on kernels of both bitnesses under various conditions, and it
      contains testcases for several now-fixed bugs in IRET error
      handling.
      
      If you run it on older kernels without the fixes, your system will
      crash. It probably won't eat your data in the process.
      
      There is no released kernel on which the sigreturn_64 test will
      pass, but it passes on tip:x86/asm.
      
      I plan to switch to lib.mk for Linux 4.2.
      
      I'm not using the ksft_ helpers at all yet.  I can do that later.
      Signed-off-by: NAndy Lutomirski <luto@kernel.org>
      Acked-by: NShuah Khan <shuahkh@osg.samsung.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Denys Vlasenko <vda.linux@googlemail.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Shuah Khan <shuah.kh@samsung.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/89d10b76b92c7202d8123654dc8d36701c017b3d.1428386971.git.luto@kernel.org
      [ Fixed empty format string GCC build warning in trivial_32bit_program.c ]
      Signed-off-by: NIngo Molnar <mingo@kernel.org>
      3f705dfd
  4. 07 4月, 2015 8 次提交
    • L
      Linux 4.0-rc7 · f22e6e84
      Linus Torvalds 提交于
      f22e6e84
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 442bb4ba
      Linus Torvalds 提交于
      Pull networking fixes from David Miller:
      
       1) In TCP, don't register an FRTO for cumulatively ACK'd data that was
          previously SACK'd, from Neal Cardwell.
      
       2) Need to hold RNL mutex in ipv4 multicast code namespace cleanup,
          from Cong WANG.
      
       3) Similarly we have to hold RNL mutex for fib_rules_unregister(), also
          from Cong WANG.
      
       4) Revert and rework netns nsid allocation fix, from Nicolas Dichtel.
      
       5) When we encapsulate for a tunnel device, skb->sk still points to the
          user socket.  So this leads to cases where we retraverse the
          ipv4/ipv6 output path with skb->sk being of some other address
          family (f.e. AF_PACKET).  This can cause things to crash since the
          ipv4 output path is dereferencing an AF_PACKET socket as if it were
          an ipv4 one.
      
          The short term fix for 'net' and -stable is to elide these socket
          checks once we've entered an encapsulation sequence by testing
          xmit_recursion.
      
          Longer term we have a better solution wherein we pass the tunnel's
          socket down through the output paths, but that is way too invasive
          for 'net' and -stable.
      
          From Hannes Frederic Sowa.
      
       6) l2tp_init() failure path forgets to unregister per-net ops, from
          Cong WANG.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
        net/mlx4_core: Fix error message deprecation for ConnectX-2 cards
        net: dsa: fix filling routing table from OF description
        l2tp: unregister l2tp_net_ops on failure path
        mvneta: dont call mvneta_adjust_link() manually
        ipv6: protect skb->sk accesses from recursive dereference inside the stack
        netns: don't allocate an id for dead netns
        Revert "netns: don't clear nsid too early on removal"
        ip6mr: call del_timer_sync() in ip6mr_free_table()
        net: move fib_rules_unregister() under rtnl lock
        ipv4: take rtnl_lock and mark mrt table as freed on namespace cleanup
        tcp: fix FRTO undo on cumulative ACK of SACKed range
        xen-netfront: transmit fully GSO-sized packets
      442bb4ba
    • J
      net/mlx4_core: Fix error message deprecation for ConnectX-2 cards · fde913e2
      Jack Morgenstein 提交于
      Commit 1daa4303 ("net/mlx4_core: Deprecate error message at
      ConnectX-2 cards startup to debug") did the deprecation only for port 1
      of the card. Need to deprecate for port 2 as well.
      
      Fixes: 1daa4303 ("net/mlx4_core: Deprecate error message at ConnectX-2 cards startup to debug")
      Signed-off-by: NJack Morgenstein <jackm@dev.mellanox.co.il>
      Signed-off-by: NAmir Vadai <amirv@mellanox.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      fde913e2
    • P
      net: dsa: fix filling routing table from OF description · 30303813
      Pavel Nakonechny 提交于
      According to description in 'include/net/dsa.h', in cascade switches
      configurations where there are more than one interconnected devices,
      'rtable' array in 'dsa_chip_data' structure is used to indicate which
      port on this switch should be used to send packets to that are destined
      for corresponding switch.
      
      However, dsa_of_setup_routing_table() fills 'rtable' with port numbers
      of the _target_ switch, but not current one.
      
      This commit removes redundant devicetree parsing and adds needed port
      number as a function argument. So dsa_of_setup_routing_table() now just
      looks for target switch number by parsing parent of 'link' device node.
      
      To remove possible misunderstandings with the way of determining target
      switch number, a corresponding comment was added to the source code and
      to the DSA device tree bindings documentation file.
      
      This was tested on a custom board with two Marvell 88E6095 switches with
      following corresponding routing tables: { -1, 10 } and { 8, -1 }.
      Signed-off-by: NPavel Nakonechny <pavel.nakonechny@skitlab.ru>
      Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
      Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      30303813
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 9e441639
      Linus Torvalds 提交于
      Pull input fixes from Dmitry Torokhov:
       "Updates for the input subsystem - two more tweaks for ALPS driver to
        work out kinks after splitting the touchpad, trackstick, and potential
        external PS/2 mouse into separate input devices.
      
        Changes to support ALPS SS4 devices (protocol V8) will be coming in
        4.1..."
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
        Input: alps - document stick behavior for protocol V2
        Input: alps - report V2 Dualpoint Stick events via the right evdev node
        Input: alps - report interleaved bare PS/2 packets via dev3
      9e441639
    • W
      67e04c29
    • S
      mvneta: dont call mvneta_adjust_link() manually · ecf7b361
      Stas Sergeev 提交于
      mvneta_adjust_link() is a callback for of_phy_connect() and should
      not be called directly. The result of calling it directly is as below:
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ecf7b361
    • H
      ipv6: protect skb->sk accesses from recursive dereference inside the stack · f60e5990
      hannes@stressinduktion.org 提交于
      We should not consult skb->sk for output decisions in xmit recursion
      levels > 0 in the stack. Otherwise local socket settings could influence
      the result of e.g. tunnel encapsulation process.
      
      ipv6 does not conform with this in three places:
      
      1) ip6_fragment: we do consult ipv6_npinfo for frag_size
      
      2) sk_mc_loop in ipv6 uses skb->sk and checks if we should
         loop the packet back to the local socket
      
      3) ip6_skb_dst_mtu could query the settings from the user socket and
         force a wrong MTU
      
      Furthermore:
      In sk_mc_loop we could potentially land in WARN_ON(1) if we use a
      PF_PACKET socket ontop of an IPv6-backed vxlan device.
      
      Reuse xmit_recursion as we are currently only interested in protecting
      tunnel devices.
      
      Cc: Jiri Pirko <jiri@resnulli.us>
      Signed-off-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      f60e5990
  5. 06 4月, 2015 6 次提交
  6. 05 4月, 2015 3 次提交
    • L
      Merge tag 'usb-4.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · f8b3d8a5
      Linus Torvalds 提交于
      Pull USB fixes from Greg KH:
       "Here are some small USB fixes and new device ids for 4.0-rc6.  Nothing
        major, some xhci fixes for reported problems, and some usb-serial
        device ids.
      
        All have been in linux-next for a while"
      
      * tag 'usb-4.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
        USB: ftdi_sio: Use jtag quirk for SNAP Connect E10
        usb: isp1760: fix spin unlock in the error path of isp1760_udc_start
        usb: xhci: apply XHCI_AVOID_BEI quirk to all Intel xHCI controllers
        usb: xhci: handle Config Error Change (CEC) in xhci driver
        USB: keyspan_pda: add new device id
        USB: ftdi_sio: Added custom PID for Synapse Wireless product
      f8b3d8a5
    • L
      Merge tag 'staging-4.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · 8eb6dcf9
      Linus Torvalds 提交于
      Pull staging driver fixes from Greg KH:
       "Here are some staging driver fixes, well, really all just IIO driver
        fixes, for 4.0-rc6.  They fix issues that have been reported with
        these drivers.
      
        All of these patches have been in linux-next for a while"
      
      * tag 'staging-4.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
        iio: imu: Use iio_trigger_get for indio_dev->trig assignment
        iio: adc: vf610: use ADC clock within specification
        iio/adc/cc10001_adc.c: Fix !HAS_IOMEM build
        iio: core: Fix double free.
        iio:inv-mpu6050: Fix inconsistency for the scale channel
        staging: iio: dummy: Fix undefined symbol build error
        iio: inv_mpu6050: Clear timestamps fifo while resetting hardware fifo
        staging: iio: hmc5843: Set iio name property in sysfs
        iio: bmc150: change sampling frequency
        iio: fix drivers that check buffer->scan_mask
      8eb6dcf9
    • L
      Merge tag 'tty-4.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty · eca8258b
      Linus Torvalds 提交于
      Pull tty/serial fixes from Greg KH:
       "Here are 3 serial driver fixes for 4.0-rc6.  They fix some reported
        issues with the samsung and fsl_lpuart drivers.
      
        All have been in linux-next for a while"
      
      * tag 'tty-4.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
        tty: serial: fsl_lpuart: clear receive flag on FIFO flush
        tty: serial: fsl_lpuart: specify transmit FIFO size
        serial: samsung: Clear operation mode on UART shutdown
      eca8258b
  7. 04 4月, 2015 8 次提交
    • B
      x86/alternatives: Fix ALTERNATIVE_2 padding generation properly · dbe4058a
      Borislav Petkov 提交于
      Quentin caught a corner case with the generation of instruction
      padding in the ALTERNATIVE_2 macro: if len(orig_insn) <
      len(alt1) < len(alt2), then not enough padding gets added and
      that is not good(tm) as we could overwrite the beginning of the
      next instruction.
      
      Luckily, at the time of this writing, we don't have
      ALTERNATIVE_2() invocations which have that problem and even if
      we did, a simple fix would be to prepend the instructions with
      enough prefixes so that that corner case doesn't happen.
      
      However, best it would be if we fixed it properly. See below for
      a simple, abstracted example of what we're doing.
      
      So what we ended up doing is, we compute the
      
      	max(len(alt1), len(alt2)) - len(orig_insn)
      
      and feed that value to the .skip gas directive. The max() cannot
      have conditionals due to gas limitations, thus the fancy integer
      math.
      
      With this patch, all ALTERNATIVE_2 sites get padded correctly;
      generating obscure test cases pass too:
      
        #define alt_max_short(a, b)    ((a) ^ (((a) ^ (b)) & -(-((a) < (b)))))
      
        #define gen_skip(orig, alt1, alt2, marker)	\
        	.skip -((alt_max_short(alt1, alt2) - (orig)) > 0) * \
        		(alt_max_short(alt1, alt2) - (orig)),marker
      
        	.pushsection .text, "ax"
        .globl main
        main:
        	gen_skip(1, 2, 4, 0x09)
        	gen_skip(4, 1, 2, 0x10)
        	...
        	.popsection
      
      Thanks to Quentin for catching it and double-checking the fix!
      Reported-by: NQuentin Casasnovas <quentin.casasnovas@oracle.com>
      Signed-off-by: NBorislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20150404133443.GE21152@pd.tnicSigned-off-by: NIngo Molnar <mingo@kernel.org>
      dbe4058a
    • L
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 1cced501
      Linus Torvalds 提交于
      Pull input subsystem fixes from Dmitry Torokhov:
       "A fix for ALPS driver for issue introduced in the latest update and a
        tweak for yet another Lenovo box in Synaptics.
      
        There will be more ALPS tweaks coming.."
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
        Input: define INPUT_PROP_ACCELEROMETER behavior
        Input: synaptics - fix min-max quirk value for E440
        Input: synaptics - add quirk for Thinkpad E440
        Input: ALPS - fix max coordinates for v5 and v7 protocols
        Input: add MT_TOOL_PALM
      1cced501
    • L
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 57a9d89d
      Linus Torvalds 提交于
      Pull block layer fix from Jens Axboe:
       "Just one patch in this pull request, fixing a regression caused by a
        'mathematically correct' change to lcm()"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        block: fix blk_stack_limits() regression due to lcm() change
      57a9d89d
    • L
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 567cfea9
      Linus Torvalds 提交于
      Pull x86 fixes from Ingo Molnar:
       "Misc fixes: a SYSRET single-stepping fix, a dmi-scan robustization
        fix, a reboot quirk and a kgdb fixlet"
      
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        kgdb/x86: Fix reporting of 'si' in kgdb on x86_64
        x86/asm/entry/64: Disable opportunistic SYSRET if regs->flags has TF set
        x86/reboot: Add ASRock Q1900DC-ITX mainboard reboot quirk
        MAINTAINERS: Change the x86 microcode loader maintainer
        firmware: dmi_scan: Prevent dmi_num integer overflow
      567cfea9
    • L
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · ec2e76b4
      Linus Torvalds 提交于
      Pull perf fixes from Ingo Molnar:
       "Two x86 Intel PMU constraint handling fixes"
      
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf/x86/intel: Fix Haswell CYCLE_ACTIVITY.* counter constraints
        perf/x86/intel: Filter branches for PEBS event
      ec2e76b4
    • L
      Merge tag 'devicetree-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/glikely/linux · ccc20a33
      Linus Torvalds 提交于
      Pull devicetree fix from Grant Likely:
       "Simple bugfix for bad device tree data on the PA-Semi platform"
      
      * tag 'devicetree-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/glikely/linux:
        drivers/of: Add empty ranges quirk for PA-Semi
      ccc20a33
    • L
      Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 · b010a0f7
      Linus Torvalds 提交于
      Pull CIFS fixes from Steve French:
       "A set of small cifs fixes fixing a memory leak, kernel oops, and
        infinite loop (and some spotted by Coverity)"
      
      * 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
        Fix warning
        Fix another dereference before null check warning
        CIFS: session servername can't be null
        Fix warning on impossible comparison
        Fix coverity warning
        Fix dereference before null check warning
        Don't ignore errors on encrypting password in SMBTcon
        Fix warning on uninitialized buftype
        cifs: potential memory leaks when parsing mnt opts
        cifs: fix use-after-free bug in find_writable_file
        cifs: smb2_clone_range() - exit on unhandled error
      b010a0f7
    • N
      netns: don't allocate an id for dead netns · 576b7cd2
      Nicolas Dichtel 提交于
      First, let's explain the problem.
      Suppose you have an ipip interface that stands in the netns foo and its link
      part in the netns bar (so the netns bar has an nsid into the netns foo).
      Now, you remove the netns bar:
       - the bar nsid into the netns foo is removed
       - the netns exit method of ipip is called, thus our ipip iface is removed:
         => a netlink message is built in the netns foo to advertise this deletion
         => this netlink message requests an nsid for bar, thus a new nsid is
            allocated for bar and never removed.
      
      This patch adds a check in peernet2id() so that an id cannot be allocated for
      a netns which is currently destroyed.
      Signed-off-by: NNicolas Dichtel <nicolas.dichtel@6wind.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      576b7cd2