[PATCH 5.16 0070/1017] f2fs: fix to unlock page correctly in error path of is_alive()

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 07:07:20 EST

From: Chao Yu <chao@xxxxxxxxxx>

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@xxxxxxxxxx/

Fixes: 77900c45ee5c ("f2fs: fix to do sanity check in is_alive()")
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: Pavel Machek <pavel@xxxxxxx>
Signed-off-by: Pavel Machek <pavel@xxxxxxx>
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
fs/f2fs/gc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1026,8 +1026,10 @@ 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);