1. 26 5月, 2017 18 次提交
  2. 25 5月, 2017 20 次提交
  3. 24 5月, 2017 2 次提交
    • G
      net: ieee802154: fix potential null pointer dereference · 7dab5467
      Gustavo A. R. Silva 提交于
      Null check at line 918: if (!spi) {, implies spi might be NULL.
      Function spi_get_drvdata() dereference pointer spi.
      Move pointer priv assignment after the null check.
      
      Addresses-Coverity-ID: 1408888
      Signed-off-by: NGustavo A. R. Silva <garsilva@embeddedor.com>
      Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
      7dab5467
    • L
      net: ieee802154: fix net_device reference release too early · a611c58b
      Lin Zhang 提交于
      This patch fixes the kernel oops when release net_device reference in
      advance. In function raw_sendmsg(i think the dgram_sendmsg has the same
      problem), there is a race condition between dev_put and dev_queue_xmit
      when the device is gong that maybe lead to dev_queue_ximt to see
      an illegal net_device pointer.
      
      My test kernel is 3.13.0-32 and because i am not have a real 802154
      device, so i change lowpan_newlink function to this:
      
              /* find and hold real wpan device */
              real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
              if (!real_dev)
                      return -ENODEV;
      //      if (real_dev->type != ARPHRD_IEEE802154) {
      //              dev_put(real_dev);
      //              return -EINVAL;
      //      }
              lowpan_dev_info(dev)->real_dev = real_dev;
              lowpan_dev_info(dev)->fragment_tag = 0;
              mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
      
      Also, in order to simulate preempt, i change the raw_sendmsg function
      to this:
      
              skb->dev = dev;
              skb->sk  = sk;
              skb->protocol = htons(ETH_P_IEEE802154);
              dev_put(dev);
              //simulate preempt
              schedule_timeout_uninterruptible(30 * HZ);
              err = dev_queue_xmit(skb);
              if (err > 0)
                      err = net_xmit_errno(err);
      
      and this is my userspace test code named test_send_data:
      
      int main(int argc, char **argv)
      {
              char buf[127];
              int sockfd;
              sockfd = socket(AF_IEEE802154, SOCK_RAW, 0);
              if (sockfd < 0) {
                      printf("create sockfd error: %s\n", strerror(errno));
                      return -1;
              }
              send(sockfd, buf, sizeof(buf), 0);
              return 0;
      }
      
      This is my test case:
      
      root@zhanglin-x-computer:~/develop/802154# uname -a
      Linux zhanglin-x-computer 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15
      03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
      root@zhanglin-x-computer:~/develop/802154# ip link add link eth0 name
      lowpan0 type lowpan
      root@zhanglin-x-computer:~/develop/802154#
      //keep the lowpan0 device down
      root@zhanglin-x-computer:~/develop/802154# ./test_send_data &
      //wait a while
      root@zhanglin-x-computer:~/develop/802154# ip link del link dev lowpan0
      //the device is gone
      //oops
      [381.303307] general protection fault: 0000 [#1]SMP
      [381.303407] Modules linked in: af_802154 6lowpan bnep rfcomm
      bluetooth nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek
      rts5139(C) snd_hda_intel
      snd_had_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi
      snd_seq_midi_event snd_rawmidi snd_req intel_rapl snd_seq_device
      coretemp i915 kvm_intel
      kvm snd_timer snd crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
      cypted drm_kms_helper drm i2c_algo_bit soundcore video mac_hid
      parport_pc ppdev ip parport hid_generic
      usbhid hid ahci r8169 mii libahdi
      [381.304286] CPU:1 PID: 2524 Commm: 1 Tainted: G C 0 3.13.0-32-generic
      [381.304409] Hardware name: Haier Haier DT Computer/Haier DT Codputer,
      BIOS FIBT19H02_X64 06/09/2014
      [381.304546] tasks: ffff000096965fc0 ti: ffffB0013779c000 task.ti:
      ffffB8013779c000
      [381.304659] RIP: 0010:[<ffffffff01621fe1>] [<ffffffff81621fe1>]
      __dev_queue_ximt+0x61/0x500
      [381.304798] RSP: 0018:ffffB8013779dca0 EFLAGS: 00010202
      [381.304880] RAX: 272b031d57565351 RBX: 0000000000000000 RCX: ffff8800968f1a00
      [381.304987] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8800968f1a00
      [381.305095] RBP: ffff8e013773dce0 R08: 0000000000000266 R09: 0000000000000004
      [381.305202] R10: 0000000000000004 R11: 0000000000000005 R12: ffff88013902e000
      [381.305310] R13: 000000000000007f R14: 000000000000007f R15: ffff8800968f1a00
      [381.305418] FS:  00007fc57f50f740(0000) GS: ffff88013fc80000(0000)
      knlGS: 0000000000000000
      [381.305540] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
      [381.305627] CR2: 00007fad0841c000 CR3: 00000001368dd000 CR4: 00000000001007e0
      [361.905734] Stack:
      [381.305768]  00000000002052d0 000000003facb30a ffff88013779dcc0
      ffff880137764000
      [381.305898]  ffff88013779de70 000000000000007f 000000000000007f
      ffff88013902e000
      [381.306026]  ffff88013779dcf0 ffffffff81622490 ffff88013779dd39
      ffffffffa03af9f1
      [381.306155] Call Trace:
      [381.306202]  [<ffffffff81622490>] dev_queue_xmit+0x10/0x20
      [381.306294]  [<ffffffffa03af9f1>] raw_sendmsg+0x1b1/0x270 [af_802154]
      [381.306396]  [<ffffffffa03af054>] ieee802154_sock_sendmsg+0x14/0x20 [af_802154]
      [381.306512]  [<ffffffff816079eb>] sock_sendmsg+0x8b/0xc0
      [381.306600]  [<ffffffff811d52a5>] ? __d_alloc+0x25/0x180
      [381.306687]  [<ffffffff811a1f56>] ? kmem_cache_alloc_trace+0x1c6/0x1f0
      [381.306791]  [<ffffffff81607b91>] SYSC_sendto+0x121/0x1c0
      [381.306878]  [<ffffffff8109ddf4>] ? vtime_account_user+x54/0x60
      [381.306975]  [<ffffffff81020d45>] ? syscall_trace_enter+0x145/0x250
      [381.307073]  [<ffffffff816086ae>] SyS_sendto+0xe/0x10
      [381.307156]  [<ffffffff8172c87f>] tracesys+0xe1/0xe6
      [381.307233] Code: c6 a1 a4 ff 41 8b 57 78 49 8b 47 20 85 d2 48 8b 80
      78 07 00 00 75 21 49 8b 57 18 48 85 d2 74 18 48 85 c0 74 13 8b 92 ac
      01 00 00 <3b> 50 10 73 08 8b 44 90 14 41 89 47 78 41 f6 84 24 d5 00 00
      00
      [381.307801] RIP [<ffffffff81621fe1>] _dev_queue_xmit+0x61/0x500
      [381.307901]  RSP <ffff88013779dca0>
      [381.347512] Kernel panic - not syncing: Fatal exception in interrupt
      [381.347747] drm_kms_helper: panic occurred, switching back to text console
      
      In my opinion, there is always exist a chance that the device is gong
      before call dev_queue_xmit.
      
      I think the latest kernel is have the same problem and that
      dev_put should be behind of the dev_queue_xmit.
      Signed-off-by: NLin Zhang <xiaolou4617@gmail.com>
      Acked-by: NStefan Schmidt <stefan@osg.samsung.com>
      Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
      a611c58b