linux-kernel - [PATCH] ima: Fix warn potential negative subtraction from max

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Message-Id: <1513871754-13943-1-git-send-email-gomonovych@gmail.com>
Date:   Thu, 21 Dec 2017 16:55:53 +0100
From:   Vasyl Gomonovych <gomonovych@...il.com>
To:     zohar@...ux.vnet.ibm.com, dmitry.kasatkin@...il.com,
        james.l.morris@...cle.com, serge@...lyn.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, gomonovych@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] ima: Fix warn potential negative subtraction from max

Found by smatch:
security/integrity/ima/ima_queue.c:122 ima_add_digest_entry() warn:
potential negative subtraction from max '(~0)- size'

Signed-off-by: Vasyl Gomonovych <gomonovych@...il.com>
---
 security/integrity/ima/ima_queue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c
index a02a86d51102..446018478b81 100644
--- a/security/integrity/ima/ima_queue.c
+++ b/security/integrity/ima/ima_queue.c
@@ -116,7 +116,7 @@ static int ima_add_digest_entry(struct ima_template_entry *entry,
 	}
 
 	if (binary_runtime_size != ULONG_MAX) {
-		int size;
+		unsigned int size;
 
 		size = get_binary_runtime_size(entry);
 		binary_runtime_size = (binary_runtime_size < ULONG_MAX - size) ?
-- 
1.9.1