linux-kernel - [PATCH 5/5] ext4: unsigned int compared against zero

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Date:   Thu, 30 Apr 2020 10:05:21 +0530
From:   ashwin-h <ashwinh@...are.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>
CC:     <linux-ext4@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...nel.org>, <srivatsab@...are.com>,
        <srivatsa@...il.mit.edu>, <rostedt@...dmis.org>,
        <srostedt@...are.com>, <gregkh@...uxfoundation.org>,
        <ashwin.hiranniah@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Ashwin H <ashwinh@...are.com>
Subject: [PATCH 5/5] ext4: unsigned int compared against zero

From: Colin Ian King <colin.king@...onical.com>

commit fbbbbd2f28aec991f3fbc248df211550fbdfd58c upstream.

There are two cases where u32 variables n and err are being checked
for less than zero error values, the checks is always false because
the variables are not signed. Fix this by making the variables ints.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 345c0dbf3a30 ("ext4: protect journal inode's blocks using block_validity")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Ashwin H <ashwinh@...are.com>
---
 fs/ext4/block_validity.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index 3f3d82d..ccd80f2 100644
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -141,7 +141,8 @@ static int ext4_protect_reserved_inode(struct super_block *sb, u32 ino)
 	struct inode *inode;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	struct ext4_map_blocks map;
-	u32 i = 0, err = 0, num, n;
+	u32 i = 0, num;
+	int err = 0, n;
 
 	if ((ino < EXT4_ROOT_INO) ||
 	    (ino > le32_to_cpu(sbi->s_es->s_inodes_count)))
-- 
2.7.4