Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757246AbdDFMeG (ORCPT ); Thu, 6 Apr 2017 08:34:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40170 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757218AbdDFMdx (ORCPT ); Thu, 6 Apr 2017 08:33:53 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com A35B5C04B956 Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=vdronov@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com A35B5C04B956 From: Vladis Dronov To: VMware Graphics , Sinclair Yeh , Thomas Hellstrom , David Airlie , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Vladis Dronov Subject: [PATCH v2] kernel: drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl() Date: Thu, 6 Apr 2017 14:33:40 +0200 Message-Id: <20170406123340.5368-1-vdronov@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 06 Apr 2017 12:33:46 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 974 Lines: 27 The 'req->mip_levels' parameter in vmw_gb_surface_define_ioctl() is a user-controlled 'uint32_t' value which is used as a loop count limit. This can lead to a kernel lockup and DoS. Add check for 'req->mip_levels'. References: https://bugzilla.redhat.com/show_bug.cgi?id=1437431 Signed-off-by: Vladis Dronov --- drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c index b445ce9..e0d7ff9 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c @@ -1281,6 +1281,9 @@ int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data, if (req->multisample_count != 0) return -EINVAL; + if (req->mip_levels > DRM_VMW_MAX_MIP_LEVELS) + return -EINVAL; + if (unlikely(vmw_user_surface_size == 0)) vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) + 128; -- 2.9.3