From patchwork Fri Mar 29 02:40:21 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 2361201 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) by patchwork1.kernel.org (Postfix) with ESMTP id 625053FD40 for ; Fri, 29 Mar 2013 02:49:17 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [IPv6:::1]) by mail.linuxfoundation.org (Postfix) with ESMTP id DA52FB8C; Fri, 29 Mar 2013 02:46:02 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTP id 3AE9698F for ; Fri, 29 Mar 2013 02:45:58 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from kirsty.vergenet.net (kirsty.vergenet.net [202.4.237.240]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 14A2E20141 for ; Fri, 29 Mar 2013 02:45:49 +0000 (UTC) Received: from ayumi.akashicho.tokyo.vergenet.net (p8120-ipbfp1001kobeminato.hyogo.ocn.ne.jp [118.10.137.120]) by kirsty.vergenet.net (Postfix) with ESMTP id 5EA5C2C69E7; Fri, 29 Mar 2013 13:45:36 +1100 (EST) Received: by ayumi.akashicho.tokyo.vergenet.net (Postfix, from userid 7100) id 03837EDEA2A; Fri, 29 Mar 2013 11:45:34 +0900 (JST) From: Simon Horman To: ltsi-dev@lists.linuxfoundation.org Date: Fri, 29 Mar 2013 11:40:21 +0900 Message-Id: <1364525119-31791-93-git-send-email-horms+renesas@verge.net.au> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1364525119-31791-1-git-send-email-horms+renesas@verge.net.au> References: <1364525119-31791-1-git-send-email-horms+renesas@verge.net.au> X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, RP_MATCHES_RCVD autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: Magnus Damm Subject: [LTSI-dev] [PATCH/RFC 092/390] drm/fb_helper: Fix potential NULL pointer dereference X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org From: Sachin Kamat kcalloc returns NULL on failure. Hence check for the return value and exit on error to avoid NULL pointer dereference. Fixes the following smatch errors: drivers/gpu/drm/drm_fb_helper.c:1271 drm_setup_crtcs() error: potential null dereference 'modes'. (kcalloc returns null) drivers/gpu/drm/drm_fb_helper.c:1272 drm_setup_crtcs() error: potential null dereference 'crtcs'. (kcalloc returns null) Signed-off-by: Sachin Kamat Signed-off-by: Dave Airlie (cherry picked from commit 8c5eaca012f963fa9724665f8a0eca19e3cb7d2a) Signed-off-by: Simon Horman --- drivers/gpu/drm/drm_fb_helper.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 3928e88..72aef36 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1251,6 +1251,11 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) sizeof(struct drm_display_mode *), GFP_KERNEL); enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool), GFP_KERNEL); + if (!crtcs || !modes || !enabled) { + DRM_ERROR("Memory allocation failed\n"); + goto out; + } + drm_enable_connectors(fb_helper, enabled); @@ -1289,6 +1294,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) } } +out: kfree(crtcs); kfree(modes); kfree(enabled);