ext4: fix error code in ext4_commit_super

commit f88f1466e2a2e5ca17dfada436d3efa1b03a3972 upstream.

We should set the error code when ext4_commit_super check argument failed.
Found in code review.
Fixes: c4be0c1dc4cdc ("filesystem freeze: add error handling of write_super_lockfs/unlockfs").
Cc: stable@kernel.org
Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Link: https://lore.kernel.org/r/20210402101631.561-1-changfengnan@vivo.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ca7b4af14e1e1cbfb93b52d73d71d065a91ca28a..ce883bed1355a1fbf8755be99c19999c61efea93 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5559,8 +5559,10 @@ static int ext4_commit_super(struct super_block *sb)
        struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
        int error = 0;
 
-       if (!sbh || block_device_ejected(sb))
-               return error;
+       if (!sbh)
+               return -EINVAL;
+       if (block_device_ejected(sb))
+               return -ENODEV;
 
        ext4_update_super(sb);