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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 127D9C4708E for ; Tue, 7 Nov 2023 12:29:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7349310E5A4; Tue, 7 Nov 2023 12:29:03 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C62A10E5A0; Tue, 7 Nov 2023 12:29:01 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id E6584611FE; Tue, 7 Nov 2023 12:29:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8109FC433C9; Tue, 7 Nov 2023 12:28:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699360140; bh=7wbJdA3ghOcU/xwQGrXIOSq9/8v6+kYwE1zY/1YVvWc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c0ihbdil1CE5jFw7gCgBbVtOmBrErRaI+7vbEculHKXlPj91q/Jj5O0adS+TuJplC JOOgfL5kmgKUSXYsRdKvrkZ3cPlT66L2eX3YQJLWMzsdDN1hiycnYp83rljSGKKrbM k+y6go0iAS9ch2aQTocOpns0vd4rdeQWJu0Ropa+diY1G+9etbaQ/XEID/ctTJXFUN 26gWNn7Sq5US7cRjyPipk34Vd6vI/7DWOr38ubbM93SYYLTHxeFWjnVk62aHJvRwLl 3+S3VEGUHOfgoMkx4e4ZeaMX/EpZWIu6b3Q9PYJgx7XowjYLiNCQWIiqqi9U8FMNPo oKjOq+6qRKCug== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 20/25] drm/amdgpu/vkms: fix a possible null pointer dereference Date: Tue, 7 Nov 2023 07:26:59 -0500 Message-ID: <20231107122745.3761613-20-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107122745.3761613-1-sashal@kernel.org> References: <20231107122745.3761613-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.61 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , guchun.chen@amd.com, Xinhui.Pan@amd.com, Ma Ke , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Alex Deucher , christian.koenig@amd.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 d60c4a2eeb0c5..06980b8527ff8 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