[PATCH] fat: release buffer head after rebuilding parent

[Yichong Chen]

fat_scan_logstart() leaves the matching directory entry's buffer head in
sinfo.bh for the caller to release, just like fat_scan().

fat_rebuild_parent() uses the directory entry to rebuild the parent inode
for the nostale_ro NFS export path, but does not release sinfo.bh after a
successful scan.  Release it once fat_build_inode() has consumed the
directory entry data.

Fixes: f1e6fb0ab451 ("fat (exportfs): rebuild directory-inode if fat_dget()")
Signed-off-by: Yichong Chen <chenyichong@xxxxxxxxxxxxx>
---
 fs/fat/nfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
index 509eea9..6e1b371 100644
--- a/fs/fat/nfs.c
+++ b/fs/fat/nfs.c
@@ -250,8 +250,10 @@ struct inode *fat_rebuild_parent(struct super_block *sb, int parent_logstart)
 		MSDOS_I(dummy_grand_parent)->i_pos = -1;
 	}
 
-	if (!fat_scan_logstart(dummy_grand_parent, clus_to_match, &sinfo))
+	if (!fat_scan_logstart(dummy_grand_parent, clus_to_match, &sinfo)) {
 		parent = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+		brelse(sinfo.bh);
+	}
 
 	brelse(parent_bh);
 	iput(dummy_grand_parent);
-- 
2.51.0