linux-kernel - [PATCH RESEND] audit: fix signedness bug in audit_log_execve

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Message-Id: <1324424381-7577-1-git-send-email-xi.wang@gmail.com>
Date:	Tue, 20 Dec 2011 18:39:41 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>, Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Xi Wang <xi.wang@...il.com>
Subject: [PATCH RESEND] audit: fix signedness bug in audit_log_execve_info()

In the loop, a size_t "len" is used to hold the return value of
audit_log_single_execve_arg(), which returns -1 on error.  In that
case the error handling (len <= 0) will be bypassed since "len" is
unsigned, and the loop continues with (p += len) being wrapped.
Change the type of "len" to signed int to fix the error handling.

	size_t len;
	...
	for (...) {
		len = audit_log_single_execve_arg(...);
		if (len <= 0)
			break;
		p += len;
	}

Signed-off-by: Xi Wang <xi.wang@...il.com>
---
 kernel/auditsc.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 47b7fc1..5b118d8 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1166,8 +1166,8 @@ static void audit_log_execve_info(struct audit_context *context,
 				  struct audit_buffer **ab,
 				  struct audit_aux_data_execve *axi)
 {
-	int i;
-	size_t len, len_sent = 0;
+	int i, len;
+	size_t len_sent = 0;
 	const char __user *p;
 	char *buf;
 
-- 
1.7.5.4

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