f2fs: fix to unlock page correctly in error path of is_alive()

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>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 264821d..ceb5fc6 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1023,8 +1023,10 @@ 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);