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 X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE6A0C43616 for ; Mon, 3 May 2021 17:07:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9F772610A5 for ; Mon, 3 May 2021 17:07:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236388AbhECRGj (ORCPT ); Mon, 3 May 2021 13:06:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:43246 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235305AbhECQ4K (ORCPT ); Mon, 3 May 2021 12:56:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5574361969; Mon, 3 May 2021 16:43:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620060205; bh=iF/yoIy/SeFtrRmptbNe5kD87n/yYWTYJIWVBewqFKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s6YGwkj0Aa8qtnY91qwVuCW/AMhAyiOGsZi9uvcilXMPab22Mmg05QhHzJlkhO/sn RLpxMISQbEvusj0fS+hRcR7G8C28AZJyfKBFPv0TaCwlgULCAfN9xaIOVU7sB9Iy8f MBVt86vN0AoYGwGfeQIzLknd5OsDRYyDxvIiFKKJMVIEYAbQnx2Fs9DStayIchRAXT fXWO1xwaPQywxvuY24medaS9F7HS4ntr5PnhysfYHw5h7nAmXbgqai3veTvyrMEZzQ mTR6zANzevXZjnDqDsZOQAXexxLQE6qp+E452lZwoyCIlK6OgGFMCj0T3MCpRmYX34 1fYx/pNeAHDNw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Guchun Chen , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher , Sasha Levin , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.9 22/24] drm/amdgpu: fix NULL pointer dereference Date: Mon, 3 May 2021 12:42:50 -0400 Message-Id: <20210503164252.2854487-22-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210503164252.2854487-1-sashal@kernel.org> References: <20210503164252.2854487-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guchun Chen [ Upstream commit 3c3dc654333f6389803cdcaf03912e94173ae510 ] ttm->sg needs to be checked before accessing its child member. Call Trace: amdgpu_ttm_backend_destroy+0x12/0x70 [amdgpu] ttm_bo_cleanup_memtype_use+0x3a/0x60 [ttm] ttm_bo_release+0x17d/0x300 [ttm] amdgpu_bo_unref+0x1a/0x30 [amdgpu] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x78b/0x8b0 [amdgpu] kfd_ioctl_alloc_memory_of_gpu+0x118/0x220 [amdgpu] kfd_ioctl+0x222/0x400 [amdgpu] ? kfd_dev_is_large_bar+0x90/0x90 [amdgpu] __x64_sys_ioctl+0x8e/0xd0 ? __context_tracking_exit+0x52/0x90 do_syscall_64+0x33/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f97f264d317 Code: b3 66 90 48 8b 05 71 4b 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 41 4b 2d 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdb402c338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f97f3cc63a0 RCX: 00007f97f264d317 RDX: 00007ffdb402c380 RSI: 00000000c0284b16 RDI: 0000000000000003 RBP: 00007ffdb402c380 R08: 00007ffdb402c428 R09: 00000000c4000004 R10: 00000000c4000004 R11: 0000000000000246 R12: 00000000c0284b16 R13: 0000000000000003 R14: 00007f97f3cc63a0 R15: 00007f8836200000 Signed-off-by: Guchun Chen Acked-by: Christian König Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 80c60a62d39e..7271e3f32d82 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -652,7 +652,7 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm) DMA_BIDIRECTIONAL : DMA_TO_DEVICE; /* double check that we don't free the table twice */ - if (!ttm->sg->sgl) + if (!ttm->sg || !ttm->sg->sgl) return; /* free the sg table and pages again */ -- 2.30.2