FAILED: patch "[PATCH] f2fs: fix dentry folio leak in find_in_level" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x cca7d3e30bf30333314e31bc70b9a739f1342167
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026090915-cargo-unclothed-b04d@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From cca7d3e30bf30333314e31bc70b9a739f1342167 Mon Sep 17 00:00:00 2001
From: Guanghui Yang <[email protected]>
Date: Sun, 19 Jul 2026 16:45:14 +0800
Subject: [PATCH] f2fs: fix dentry folio leak in find_in_level

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.

index a9563f7fcd88..0562ad211351 100644
@@ -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;

From: Guanghui Yang <[email protected]>

[ Upstream commit cca7d3e30bf30333314e31bc70b9a739f1342167 ]

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.

---
 fs/f2fs/dir.c | 1 +
 1 file changed, 1 insertion(+)

index 29ac1e77b5d7a..cadc32959a23f 100644
@@ -374,6 +374,7 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir,
 
 		de = find_in_block(dir, dentry_page, fname, &max_slots, use_hash);
 		if (IS_ERR(de)) {
+			f2fs_put_page(dentry_page, 0);
 			*res_page = ERR_CAST(de);
 			de = NULL;
 			break;

2.53.0