linux-kernel - [PATCH v2] ext4: mballoc: avoid garbage value from err

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Message-Id: <20230725043310.1227621-1-suhui@nfschina.com>
Date:   Tue, 25 Jul 2023 12:33:11 +0800
From:   Su Hui <suhui@...china.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, nathan@...nel.org,
        ndesaulniers@...gle.com, trix@...hat.com
Cc:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, kernel-janitors@...r.kernel.org,
        Su Hui <suhui@...china.com>
Subject: [PATCH v2] ext4: mballoc: avoid garbage value from err

clang's static analysis warning: fs/ext4/mballoc.c
line 4178, column 6, Branch condition evaluates to a garbage value.

err is uninitialized and will be judged when 'len <= 0' or
it first enters the loop while the condition "!ext4_sb_block_valid()"
is true. Although this can't make problems now, it's better to
correct it.

Signed-off-by: Su Hui <suhui@...china.com>
---
v2:
 - modify commit message

 fs/ext4/mballoc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 21b903fe546e..769000c970b0 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4084,7 +4084,7 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	ext4_group_t group;
 	ext4_grpblk_t blkoff;
-	int i, err;
+	int i, err = 0;
 	int already;
 	unsigned int clen, clen_changed, thisgrp_len;
 
-- 
2.30.2