linux-kernel - [PATCH v2] f2fs: fix to unlock page correctly in error path of is

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Message-Id: <20220204032114.43720-1-chao@kernel.org>
Date:   Fri,  4 Feb 2022 11:21:14 +0800
From:   Chao Yu <chao@...nel.org>
To:     jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <chao@...nel.org>,
        stable@...r.kernel.org, Pavel Machek <pavel@...x.de>
Subject: [PATCH v2] f2fs: fix to unlock page correctly in error path of is_alive()

As Pavel Machek reported in below link [1]:

After commit 77900c45ee5c ("f2fs: fix to do sanity check in is_alive()"),
node page should be unlock via calling f2fs_put_page() in the error path
of is_alive(), otherwise, f2fs may hang when it tries to lock the node
page, fix it.

[1] https://lore.kernel.org/stable/20220124203637.GA19321@duo.ucw.cz/

Fixes: 77900c45ee5c ("f2fs: fix to do sanity check in is_alive()")
Cc: <stable@...r.kernel.org>
Reported-by: Pavel Machek <pavel@...x.de>
Signed-off-by: Pavel Machek <pavel@...x.de>
Signed-off-by: Chao Yu <chao@...nel.org>
---
v2:
- Cc stable-kernel mailing list.
 fs/f2fs/gc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 0a6b0a8ae97e..2d53ef121e76 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1038,8 +1038,10 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 	}
 
-	if (f2fs_check_nid_range(sbi, dni->ino))
+	if (f2fs_check_nid_range(sbi, dni->ino)) {
+		f2fs_put_page(node_page, 1);
 		return false;
+	}
 
 	*nofs = ofs_of_node(node_page);
 	source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
-- 
2.32.0