diff mbox series

[5.5,165/257] btrfs: fix missing semaphore unlock in btrfs_sync_file

Message ID 20200416131347.137167039@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH April 16, 2020, 1:23 p.m. UTC 
From: Robbie Ko <robbieko@synology.com>

commit 6ff06729c22ec0b7498d900d79cc88cfb8aceaeb upstream.

Ordered ops are started twice in sync file, once outside of inode mutex
and once inside, taking the dio semaphore. There was one error path
missing the semaphore unlock.

Fixes: aab15e8ec2576 ("Btrfs: fix rare chances for data loss when doing a fast fsync")
CC: stable@vger.kernel.org # 4.19+
Signed-off-by: Robbie Ko <robbieko@synology.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
[ add changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/file.c |    1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2135,6 +2135,7 @@  int btrfs_sync_file(struct file *file, l
 	 */
 	ret = start_ordered_ops(inode, start, end);
 	if (ret) {
+		up_write(&BTRFS_I(inode)->dio_sem);
 		inode_unlock(inode);
 		goto out;
 	}