From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5CEEAC4167B for ; Tue, 7 Nov 2023 12:31:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232487AbjKGMb1 (ORCPT ); Tue, 7 Nov 2023 07:31:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234466AbjKGMbA (ORCPT ); Tue, 7 Nov 2023 07:31:00 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E983E383A8; Tue, 7 Nov 2023 04:20:42 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CEF6C433C7; Tue, 7 Nov 2023 12:20:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699359642; bh=p6dqhynzw7kgLq3cCx5TOuot99Y+ZNo09mt9eGTfxsM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ASTQAOxRciKJnFXsWYfMJOH4H4FsmboqBMLn0zh9I79BRC931fORAJ1RvjemS/Aqv 4H2KmgFkWsSe0afzkJipVqtiNodETyc79KICvijWTDgVqcObMPTnFoeb7XFNvreM3b Cy31ZlidKmL270XutFr1X7kHwObnaTYqYvhyIN0+JhuNpSAm9T+pFjB5bjAi1ACGBc WndednfhyFUHwM9rVw3D+guIf1+vJR48TH93O6FusQkXQ4RVnkWz5EnNAO+pyMdn9x 9GGD+M2U0Fr2Jtb3lkg+JADFFylcxm/02D5R5tjQ/LI8fVxuhU0RUCpnG/0sx3aCDG 2741E3dXFIQ3Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ma Ke , Alex Deucher , Sasha Levin , christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, guchun.chen@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.6 27/40] drm/amdgpu/vkms: fix a possible null pointer dereference Date: Tue, 7 Nov 2023 07:16:29 -0500 Message-ID: <20231107121837.3759358-27-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107121837.3759358-1-sashal@kernel.org> References: <20231107121837.3759358-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ma Ke [ Upstream commit cd90511557fdfb394bb4ac4c3b539b007383914c ] In amdgpu_vkms_conn_get_modes(), the return value of drm_cvt_mode() is assigned to mode, which will lead to a NULL pointer dereference on failure of drm_cvt_mode(). Add a check to avoid null pointer dereference. Signed-off-by: Ma Ke Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c index 7148a216ae2fe..db6fc0cb18eb8 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c @@ -239,6 +239,8 @@ static int amdgpu_vkms_conn_get_modes(struct drm_connector *connector) for (i = 0; i < ARRAY_SIZE(common_modes); i++) { mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false); + if (!mode) + continue; drm_mode_probed_add(connector, mode); } -- 2.42.0