Re: [PATCH v2 1/2] ocfs2: cancel dqi_sync_work before freeing oinfo

From: heming.zhao@xxxxxxxx
Date: Wed Sep 04 2024 - 03:33:35 EST




On 9/4/24 15:10, Joseph Qi wrote:
ocfs2_global_read_info() will initialize and schedule dqi_sync_work at
the end, if error occurs after successfully reading global quota, it
will trigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled:

ODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c

This blames there is an active delayed work when freeing oinfo in error
handling, so cancel dqi_sync_work first. BTW, return status instead of
-1 when .read_file_info fails.

Link: https://syzkaller.appspot.com/bug?extid=f7af59df5d6b25f0febd
Reported-by: syzbot+f7af59df5d6b25f0febd@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+f7af59df5d6b25f0febd@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 171bf93ce11f ("ocfs2: Periodic quota syncing")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>

looks good to me.
Reviewed-by: Heming Zhao <heming.zhao@xxxxxxxx>

---
fs/ocfs2/quota_local.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index 8ce462c64c51..73d3367c533b 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -692,7 +692,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
int status;
struct buffer_head *bh = NULL;
struct ocfs2_quota_recovery *rec;
- int locked = 0;
+ int locked = 0, global_read = 0;
info->dqi_max_spc_limit = 0x7fffffffffffffffLL;
info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
@@ -700,6 +700,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
if (!oinfo) {
mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
" info.");
+ status = -ENOMEM;
goto out_err;
}
info->dqi_priv = oinfo;
@@ -712,6 +713,7 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
status = ocfs2_global_read_info(sb, type);
if (status < 0)
goto out_err;
+ global_read = 1;
status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
if (status < 0) {
@@ -782,10 +784,12 @@ static int ocfs2_local_read_info(struct super_block *sb, int type)
if (locked)
ocfs2_inode_unlock(lqinode, 1);
ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
+ if (global_read)
+ cancel_delayed_work_sync(&oinfo->dqi_sync_work);
kfree(oinfo);
}
brelse(bh);
- return -1;
+ return status;
}
/* Write local info to quota file */