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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Pavel Machek <pavel@denx.de>,
        Chao Yu <chao@kernel.org>, Jaegeuk Kim <jaegeuk@kernel.org>
Subject: [PATCH 5.15 067/913] f2fs: fix to unlock page correctly in error path of is_alive()
Date:   Tue,  5 Apr 2022 09:18:49 +0200
Message-Id: <20220405070341.831433895@linuxfoundation.org>
In-Reply-To: <20220405070339.801210740@linuxfoundation.org>
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From: Chao Yu <chao@kernel.org>

commit 6d18762ed5cd549fde74fd0e05d4d87bac5a3beb upstream.

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@vger.kernel.org>
Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/gc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1023,8 +1023,10 @@ static bool is_alive(struct f2fs_sb_info
 		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);