提交 4b41f3c0 编写于 作者: J Juhyung Park 提交者: Zheng Zengkai

f2fs: quota: fix loop condition at f2fs_quota_sync()

stable inclusion
from stable-v5.10.110
commit e58ee6bd939b773675240f5d0f5b88a367c037c4
bugzilla: https://gitee.com/openeuler/kernel/issues/I574AL

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e58ee6bd939b773675240f5d0f5b88a367c037c4

--------------------------------

commit 680af5b8 upstream.

cnt should be passed to sb_has_quota_active() instead of type to check
active quota properly.

Moreover, when the type is -1, the compiler with enough inline knowledge
can discard sb_has_quota_active() check altogether, causing a NULL pointer
dereference at the following inode_lock(dqopt->files[cnt]):

[    2.796010] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a0
[    2.796024] Mem abort info:
[    2.796025]   ESR = 0x96000005
[    2.796028]   EC = 0x25: DABT (current EL), IL = 32 bits
[    2.796029]   SET = 0, FnV = 0
[    2.796031]   EA = 0, S1PTW = 0
[    2.796032] Data abort info:
[    2.796034]   ISV = 0, ISS = 0x00000005
[    2.796035]   CM = 0, WnR = 0
[    2.796046] user pgtable: 4k pages, 39-bit VAs, pgdp=00000003370d1000
[    2.796048] [00000000000000a0] pgd=0000000000000000, pud=0000000000000000
[    2.796051] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[    2.796056] CPU: 7 PID: 640 Comm: f2fs_ckpt-259:7 Tainted: G S                5.4.179-arter97-r8-64666-g2f16e087f9d8 #1
[    2.796057] Hardware name: Qualcomm Technologies, Inc. Lahaina MTP lemonadep (DT)
[    2.796059] pstate: 80c00005 (Nzcv daif +PAN +UAO)
[    2.796065] pc : down_write+0x28/0x70
[    2.796070] lr : f2fs_quota_sync+0x100/0x294
[    2.796071] sp : ffffffa3f48ffc30
[    2.796073] x29: ffffffa3f48ffc30 x28: 0000000000000000
[    2.796075] x27: ffffffa3f6d718b8 x26: ffffffa415fe9d80
[    2.796077] x25: ffffffa3f7290048 x24: 0000000000000001
[    2.796078] x23: 0000000000000000 x22: ffffffa3f7290000
[    2.796080] x21: ffffffa3f72904a0 x20: ffffffa3f7290110
[    2.796081] x19: ffffffa3f77a9800 x18: ffffffc020aae038
[    2.796083] x17: ffffffa40e38e040 x16: ffffffa40e38e6d0
[    2.796085] x15: ffffffa40e38e6cc x14: ffffffa40e38e6d0
[    2.796086] x13: 00000000000004f6 x12: 00162c44ff493000
[    2.796088] x11: 0000000000000400 x10: ffffffa40e38c948
[    2.796090] x9 : 0000000000000000 x8 : 00000000000000a0
[    2.796091] x7 : 0000000000000000 x6 : 0000d1060f00002a
[    2.796093] x5 : ffffffa3f48ff718 x4 : 000000000000000d
[    2.796094] x3 : 00000000060c0000 x2 : 0000000000000001
[    2.796096] x1 : 0000000000000000 x0 : 00000000000000a0
[    2.796098] Call trace:
[    2.796100]  down_write+0x28/0x70
[    2.796102]  f2fs_quota_sync+0x100/0x294
[    2.796104]  block_operations+0x120/0x204
[    2.796106]  f2fs_write_checkpoint+0x11c/0x520
[    2.796107]  __checkpoint_and_complete_reqs+0x7c/0xd34
[    2.796109]  issue_checkpoint_thread+0x6c/0xb8
[    2.796112]  kthread+0x138/0x414
[    2.796114]  ret_from_fork+0x10/0x18
[    2.796117] Code: aa0803e0 aa1f03e1 52800022 aa0103e9 (c8e97d02)
[    2.796120] ---[ end trace 96e942e8eb6a0b53 ]---
[    2.800116] Kernel panic - not syncing: Fatal exception
[    2.800120] SMP: stopping secondary CPUs

Fixes: 9de71ede ("f2fs: quota: fix potential deadlock")
Cc: <stable@vger.kernel.org> # v5.15+
Signed-off-by: NJuhyung Park <qkrwngud825@gmail.com>
Reviewed-by: NChao Yu <chao@kernel.org>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYu Liao <liaoyu15@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
上级 58a41858
......@@ -2278,7 +2278,7 @@ int f2fs_quota_sync(struct super_block *sb, int type)
struct f2fs_sb_info *sbi = F2FS_SB(sb);
struct quota_info *dqopt = sb_dqopt(sb);
int cnt;
int ret;
int ret = 0;
/*
* Now when everything is written we can discard the pagecache so
......@@ -2289,8 +2289,8 @@ int f2fs_quota_sync(struct super_block *sb, int type)
if (type != -1 && cnt != type)
continue;
if (!sb_has_quota_active(sb, type))
return 0;
if (!sb_has_quota_active(sb, cnt))
continue;
inode_lock(dqopt->files[cnt]);
......
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