[PATCH 1/4] xfs: drop the scrub file's iolock when transaction allocation fails

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

If the transaction allocation in the !orphanage_available case of
xrep_nlinks_repair_inode fails, we need to drop the IOLOCK of the file
being scrubbed before exiting.

Found by fuzzing u3.sfdir3.list[1].name = zeroes in xfs/1546.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/xfs/scrub/nlinks_repair.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)


diff --git a/fs/xfs/scrub/nlinks_repair.c b/fs/xfs/scrub/nlinks_repair.c
index 78d0f650fe89..b3e707f47b7b 100644
--- a/fs/xfs/scrub/nlinks_repair.c
+++ b/fs/xfs/scrub/nlinks_repair.c
@@ -138,8 +138,10 @@ xrep_nlinks_repair_inode(
 
 		error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0,
 				&sc->tp);
-		if (error)
+		if (error) {
+			xchk_iunlock(sc, XFS_IOLOCK_EXCL);
 			return error;
+		}
 
 		xchk_ilock(sc, XFS_ILOCK_EXCL);
 		xfs_trans_ijoin(sc->tp, ip, 0);