From: Davidlohr Bueso <dave@gnu.org>
Date: Fri, 28 Sep 2012 00:20:25 +0000 (+1000)
Subject: lib/gcd.c: prevent possible div by 0
X-Git-Tag: next-20121005~1^2~122
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8a578fc3fb933c06aee270f7a0642c86ff469954;p=karo-tx-linux.git

lib/gcd.c: prevent possible div by 0

Account for all properties when a and/or b are 0:
gcd(0, 0) = 0
gcd(a, 0) = a
gcd(0, b) = b

Fixes no known problems in current kernels.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/lib/gcd.c b/lib/gcd.c
index cce4f3cd14b3..3657f129d7b8 100644
--- a/lib/gcd.c
+++ b/lib/gcd.c
@@ -9,6 +9,9 @@ unsigned long gcd(unsigned long a, unsigned long b)
 
 	if (a < b)
 		swap(a, b);
+
+	if (!b)
+		return a;
 	while ((r = a % b) != 0) {
 		a = b;
 		b = r;