Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932194AbaDVVEB (ORCPT ); Tue, 22 Apr 2014 17:04:01 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36369 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757464AbaDVUVG (ORCPT ); Tue, 22 Apr 2014 16:21:06 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: YOSHIFUJI Hideaki , "David S. Miller" , Kamal Mostafa Subject: [PATCH 3.8 021/133] isdnloop: Validate NUL-terminated strings from user. Date: Tue, 22 Apr 2014 13:12:39 -0700 Message-Id: <1398197671-12786-22-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1398197671-12786-1-git-send-email-kamal@canonical.com> References: <1398197671-12786-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.8.13.22 -stable review patch. If anyone has any objections, please let me know. ------------------ From: =?UTF-8?q?YOSHIFUJI=20Hideaki=20/=20=E5=90=89=E8=97=A4=E8=8B=B1?= [ Upstream commit 77bc6bed7121936bb2e019a8c336075f4c8eef62 ] Return -EINVAL unless all of user-given strings are correctly NUL-terminated. Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller Signed-off-by: Kamal Mostafa --- drivers/isdn/isdnloop/isdnloop.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c index 02125e6..e1f8748 100644 --- a/drivers/isdn/isdnloop/isdnloop.c +++ b/drivers/isdn/isdnloop/isdnloop.c @@ -1070,6 +1070,12 @@ isdnloop_start(isdnloop_card *card, isdnloop_sdef *sdefp) return -EBUSY; if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef))) return -EFAULT; + + for (i = 0; i < 3; i++) { + if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i]))) + return -EINVAL; + } + spin_lock_irqsave(&card->isdnloop_lock, flags); switch (sdef.ptype) { case ISDN_PTYPE_EURO: -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/