linux-kernel - [PATCH 1/5] x86/cpu: Fix overrun check in arch_print_cpu

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Date:	Sat, 11 Feb 2012 22:46:17 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, Thomas Renninger <trenn@...e.de>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] x86/cpu: Fix overrun check in arch_print_cpu_modalias()

snprintf() does not return a negative value when truncating.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/kernel/cpu/match.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c
index 940e2d4..2dfa52b 100644
--- a/arch/x86/kernel/cpu/match.c
+++ b/arch/x86/kernel/cpu/match.c
@@ -67,7 +67,7 @@ ssize_t arch_print_cpu_modalias(struct device *dev,
 	for (i = 0; i < NCAPINTS*32; i++) {
 		if (boot_cpu_has(i)) {
 			n = snprintf(buf, size, ",%04X", i);
-			if (n < 0) {
+			if (n >= size) {
 				WARN(1, "x86 features overflow page\n");
 				break;
 			}
-- 
1.7.9



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