[PATCH] f2fs: fix ifolio leak in f2fs_move_inline_dirents

[Guanghui Yang]

f2fs_move_inline_dirents() documents that the caller grabs ifolio, and
that the function should release it on any error.

The f2fs_grab_cache_folio() failure path already drops ifolio, but the
f2fs_reserve_block() failure path only drops the newly grabbed folio at
the shared out label.  If f2fs_reserve_block() fails before clearing
dn.inode_folio, the caller's ifolio reference is left behind.

Release ifolio on this error path when dn.inode_folio is still set.

Signed-off-by: Guanghui Yang <3497809730@xxxxxx>
---
 fs/f2fs/inline.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index e2f7bedf1552..dea4ab957de8 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -427,8 +427,11 @@ static int f2fs_move_inline_dirents(struct inode *dir, struct folio *ifolio,
 
 	set_new_dnode(&dn, dir, ifolio, NULL, 0);
 	err = f2fs_reserve_block(&dn, 0);
-	if (err)
+	if (err) {
+		if (dn.inode_folio)
+			f2fs_folio_put(ifolio, true);
 		goto out;
+	}
 
 	if (unlikely(dn.data_blkaddr != NEW_ADDR)) {
 		f2fs_put_dnode(&dn);

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