[PATCH v2] f2fs: fix dentry folio leak in find_in_level

[Guanghui Yang]

find_in_level() gets a dentry folio with f2fs_find_data_folio() before
calling find_in_block().  If find_in_block() returns an error, the
function stores the error in res_folio and breaks out of the loop without
dropping the dentry folio.

This leaks the folio reference on the find_in_block() error path.  Drop
the dentry folio before returning the error to the caller.

Fixes: 7ad08a58bf67 ("f2fs: Handle casefolding with Encryption")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Guanghui Yang <3497809730@xxxxxx>
---
 fs/f2fs/dir.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index a9563f7fcd88..0562ad211351 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -320,6 +320,7 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir,
 
 		de = find_in_block(dir, dentry_folio, fname, &max_slots, use_hash);
 		if (IS_ERR(de)) {
+			f2fs_folio_put(dentry_folio, false);
 			*res_folio = ERR_CAST(de);
 			de = NULL;
 			break;

base-commit: a13c140cc289c0b7b3770bce5b3ad42ab35074aa
-- 
2.52.0.windows.1