From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932903Ab2JKBEm (ORCPT ); Wed, 10 Oct 2012 21:04:42 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]:55245 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932820Ab2JKBEc (ORCPT ); Wed, 10 Oct 2012 21:04:32 -0400 X-Sasl-enc: ESY7D9AottXUfd/u4SXVu3foZn1YWKZUmE6H4oSrAMD3 1349917471 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Davidlohr Bueso , Eric Dumazet , Andrew Morton , Linus Torvalds Subject: [ 011/120] lib/gcd.c: prevent possible div by 0 Date: Thu, 11 Oct 2012 09:59:23 +0900 Message-Id: <20121011005827.374358602@linuxfoundation.org> X-Mailer: git-send-email 1.8.0.rc0.18.gf84667d In-Reply-To: <20121011005825.364610894@linuxfoundation.org> References: <20121011005825.364610894@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Davidlohr Bueso commit e96875677fb2b7cb739c5d7769824dff7260d31d upstream. 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 Cc: Eric Dumazet Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- lib/gcd.c | 3 +++ 1 file changed, 3 insertions(+) --- a/lib/gcd.c +++ b/lib/gcd.c @@ -9,6 +9,9 @@ unsigned long gcd(unsigned long a, unsig if (a < b) swap(a, b); + + if (!b) + return a; while ((r = a % b) != 0) { a = b; b = r;