[PATCH -next] ext4: Fix access uninitialized 'retval' in kmmpd

If (!ext4_has_feature_mmp(sb)) then goto 'wait_to_exit' label, but
retval not be uninitialized.

Fixes: 61bb4a1c417e ("ext4: fix possible UAF when remounting r/o a mmp-protected file system")
Signed-off-by: Ye Bin <redacted>
---
 fs/ext4/mmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index bc364c119af6..cebea4270817 100644
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c

@@ -138,7 +138,7 @@ static int kmmpd(void *data)
 	unsigned mmp_check_interval;
 	unsigned long last_update_time;
 	unsigned long diff;
-	int retval;
+	int retval = 0;
 
 	mmp_block = le64_to_cpu(es->s_mmp_block);
 	mmp = (struct mmp_struct *)(bh->b_data);

-- 
2.31.1

On Tue, Jul 13, 2021 at 10:27:28AM +0800, Ye Bin wrote:

If (!ext4_has_feature_mmp(sb)) then goto 'wait_to_exit' label, but
retval not be uninitialized.

Fixes: 61bb4a1c417e ("ext4: fix possible UAF when remounting r/o a mmp-protected file system")
Signed-off-by: Ye Bin <redacted>

Thanks, applied with a slightly fixed up commit description.

					- Ted