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

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Message-ID: <20210713022728.2533770-1-yebin10@huawei.com>
Date:   Tue, 13 Jul 2021 10:27:28 +0800
From:   Ye Bin <yebin10@...wei.com>
To:     <tytso@....edu>, <jack@...e.cz>, <adilger.kernel@...ger.ca>,
        <linux-ext4@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <yukuai3@...wei.com>, Ye Bin <yebin10@...wei.com>
Subject: [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 <yebin10@...wei.com>
---
 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