diff options
| author | Jan Kara | 2021-03-15 17:59:06 +0100 |
|---|---|---|
| committer | Theodore Ts'o | 2021-03-21 00:27:49 -0400 |
| commit | 2a4ae3bcdf05b8639406eaa09a2939f3c6dd8e75 (patch) | |
| tree | 91b8caa387423ca6b69fa991141da04dd739eb58 | |
| parent | 7d8bd3c76da1d94b85e6c9b7007e20e980bfcfe6 (diff) | |
ext4: fix timer use-after-free on failed mount
When filesystem mount fails because of corrupted filesystem we first
cancel the s_err_report timer reminding fs errors every day and only
then we flush s_error_work. However s_error_work may report another fs
error and re-arm timer thus resulting in timer use-after-free. Fix the
problem by first flushing the work and only after that canceling the
s_err_report timer.
Reported-by: syzbot+628472a2aac693ab0fcd@syzkaller.appspotmail.com
Fixes: 2d01ddc86606 ("ext4: save error info to sb through journal if available")
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210315165906.2175-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index a0a256859662..b9693680463a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -5154,8 +5154,8 @@ failed_mount_wq: failed_mount3a: ext4_es_unregister_shrinker(sbi); failed_mount3: - del_timer_sync(&sbi->s_err_report); flush_work(&sbi->s_error_work); + del_timer_sync(&sbi->s_err_report); if (sbi->s_mmp_tsk) kthread_stop(sbi->s_mmp_tsk); failed_mount2: |