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| author | Chao Yu <chao@kernel.org> | 2022-11-06 21:25:44 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2022-11-11 09:48:24 -0800 |
| commit | cc249e4cba9a6002c9d9e1438daf8440a160bc9e (patch) | |
| tree | ad9ffae33e2f64679cff69351d5ebc08fa19a00a /fs/f2fs | |
| parent | 4d8d45df2252980f800c1b2fde941a103a18a70e (diff) | |
| download | linux-cc249e4cba9a6002c9d9e1438daf8440a160bc9e.tar.bz2 | |
f2fs: fix to avoid accessing uninitialized spinlock
syzbot reports a kernel bug:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
assign_lock_key+0x22a/0x240 kernel/locking/lockdep.c:981
register_lock_class+0x287/0x9b0 kernel/locking/lockdep.c:1294
__lock_acquire+0xe4/0x1f60 kernel/locking/lockdep.c:4934
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5668
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:350 [inline]
f2fs_save_errors fs/f2fs/super.c:3868 [inline]
f2fs_handle_error+0x29/0x230 fs/f2fs/super.c:3896
f2fs_iget+0x215/0x4bb0 fs/f2fs/inode.c:516
f2fs_fill_super+0x47d3/0x7b50 fs/f2fs/super.c:4222
mount_bdev+0x26c/0x3a0 fs/super.c:1401
legacy_get_tree+0xea/0x180 fs/fs_context.c:610
vfs_get_tree+0x88/0x270 fs/super.c:1531
do_new_mount+0x289/0xad0 fs/namespace.c:3040
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
F2FS-fs (loop1): Failed to read F2FS meta data inode
The root cause is if sbi->error_lock may be accessed before
its initialization, fix it.
Link: https://lore.kernel.org/linux-f2fs-devel/0000000000007edb6605ecbb6442@google.com/T/#u
Reported-by: syzbot+40642be9b7e0bb28e0df@syzkaller.appspotmail.com
Fixes: 95fa90c9e5a7 ("f2fs: support recording errors into superblock")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/super.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index a43d8a46a6e5..68a6c2eedcac 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -4196,6 +4196,9 @@ try_onemore: if (err) goto free_bio_info; + spin_lock_init(&sbi->error_lock); + memcpy(sbi->errors, raw_super->s_errors, MAX_F2FS_ERRORS); + init_f2fs_rwsem(&sbi->cp_rwsem); init_f2fs_rwsem(&sbi->quota_sem); init_waitqueue_head(&sbi->cp_wait); @@ -4263,9 +4266,6 @@ try_onemore: goto free_devices; } - spin_lock_init(&sbi->error_lock); - memcpy(sbi->errors, raw_super->s_errors, MAX_F2FS_ERRORS); - sbi->total_valid_node_count = le32_to_cpu(sbi->ckpt->valid_node_count); percpu_counter_set(&sbi->total_valid_inode_count, |