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 9241EC433F5 for ; Fri, 3 Dec 2021 06:32:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A5E72732CE; Fri, 3 Dec 2021 06:32:49 +0000 (UTC) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id D21B8732CE for ; Fri, 3 Dec 2021 06:32:47 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10186"; a="223795259" X-IronPort-AV: E=Sophos;i="5.87,283,1631602800"; d="scan'208";a="223795259" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Dec 2021 22:32:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,283,1631602800"; d="scan'208";a="677990945" Received: from pallavi-nuc8i7beh.iind.intel.com ([10.145.162.8]) by orsmga005.jf.intel.com with ESMTP; 02 Dec 2021 22:32:45 -0800 From: Pallavi Mishra To: intel-gfx@lists.freedesktop.org, thomas.hellstrom@linux.intel.com Date: Fri, 3 Dec 2021 12:02:57 +0530 Message-Id: <20211203063257.52053-1-pallavi.mishra@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [Intel-gfx] [PATCH] drm/i915: Fix possible null ptr dereferences X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pallavi Mishra Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" add null ptr checks to prevent crash/exceptions. Signed-off-by: Pallavi Mishra --- drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 3 +++ drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c | 3 ++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c index 218a9b3037c7..997fe73c205b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c @@ -906,6 +906,8 @@ vm_access_ttm(struct vm_area_struct *area, unsigned long addr, struct drm_i915_gem_object *obj = i915_ttm_to_gem(area->vm_private_data); + GEM_BUG_ON(!obj); + if (i915_gem_object_is_readonly(obj) && write) return -EACCES; @@ -966,6 +968,7 @@ static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = { void i915_ttm_bo_destroy(struct ttm_buffer_object *bo) { struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo); + GEM_BUG_ON(!obj); i915_gem_object_release_memory_region(obj); mutex_destroy(&obj->ttm.get_io_page.lock); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c index 80df9f592407..2b684903a9f5 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c @@ -371,6 +371,7 @@ int i915_ttm_move_notify(struct ttm_buffer_object *bo) struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo); int ret; + GEM_BUG_ON(!obj); ret = i915_gem_object_unbind(obj, I915_GEM_OBJECT_UNBIND_ACTIVE); if (ret) return ret; @@ -506,7 +507,7 @@ static void i915_ttm_memcpy_init(struct i915_ttm_memcpy_arg *arg, dst_reg = i915_ttm_region(bo->bdev, dst_mem->mem_type); src_reg = i915_ttm_region(bo->bdev, bo->resource->mem_type); - GEM_BUG_ON(!dst_reg || !src_reg); + GEM_BUG_ON(!dst_reg || !src_reg || !obj); arg->dst_iter = !i915_ttm_cpu_maps_iomem(dst_mem) ? ttm_kmap_iter_tt_init(&arg->_dst_iter.tt, dst_ttm) : -- 2.25.1