From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753444AbaFGBnB (ORCPT ); Fri, 6 Jun 2014 21:43:01 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:35991 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752568AbaFGBXh (ORCPT ); Fri, 6 Jun 2014 21:23:37 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Mauro Carvalho Chehab" , "Jonathan Corbet" , "Guennadi Liakhovetski" Date: Sat, 07 Jun 2014 02:26:29 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 67/92] [media] V4L2: ov7670: fix a wrong index, potentially Oopsing the kernel from user-space In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.249 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.60-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Guennadi Liakhovetski commit cfece5857ca51d1dcdb157017aba226f594e9dcf upstream. Commit 75e2bdad8901a0b599e01a96229be922eef1e488 "ov7670: allow configuration of image size, clock speed, and I/O method" uses a wrong index to iterate an array. Apart from being wrong, it also uses an unchecked value from user-space, which can cause access to unmapped memory in the kernel, triggered by a normal desktop user with rights to use V4L2 devices. Signed-off-by: Guennadi Liakhovetski Acked-by: Jonathan Corbet Signed-off-by: Mauro Carvalho Chehab [bwh: Backported to 3.2: - Adjust filename - win_sizes array is static, not per-device] Signed-off-by: Ben Hutchings --- drivers/media/video/ov7670.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/media/video/ov7670.c +++ b/drivers/media/video/ov7670.c @@ -937,7 +937,7 @@ static int ov7670_enum_framesizes(struct * windows that fall outside that. */ for (i = 0; i < N_WIN_SIZES; i++) { - struct ov7670_win_size *win = &ov7670_win_sizes[index]; + struct ov7670_win_size *win = &ov7670_win_sizes[i]; if (info->min_width && win->width < info->min_width) continue; if (info->min_height && win->height < info->min_height)