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=-19.4 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,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 44FDDC04FF3 for ; Mon, 24 May 2021 15:14:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 269746100C for ; Mon, 24 May 2021 15:14:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234700AbhEXPQQ (ORCPT ); Mon, 24 May 2021 11:16:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:40020 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235100AbhEXPFw (ORCPT ); Mon, 24 May 2021 11:05:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D653961629; Mon, 24 May 2021 14:51:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621867865; bh=uezxJvycNkTzWWdG2Ib8ONvFnB0mypIVT8Dl0Jn9muc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NQ2tGJiYw7gm0aUm3oLI0FYEKsA9yV4s1mIjqqiiZipJxO8OgSb0fSAvzYH7HMsp9 RdwTTu8SKv6EU/OD3XlrguRzoc2Q/FjB1jPz6tSclvsWItt5RNM6lv0WmkE2FLHZoK 2DysFvcLaZZIulUmtTCFQgtQCCR5gIGPLY9xKCz62I36yg1rF9knLjb0TQ7az+lOi0 1sLDiLJ52FGijglQtuC5U5cN90cF966FUH2QUUHG2i6vnCp4EygrMAWK1QkEHZpk4X wljeQcvkTTD5ZJQaHNQyCdrBDWSySJnHu80RsKhgV6JCKbBKohTMZkn4x+EzjPpvVN bBEg0JyGY/6qA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: xinhui pan , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher , Sasha Levin , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.14 21/21] drm/amdgpu: Fix a use-after-free Date: Mon, 24 May 2021 10:50:40 -0400 Message-Id: <20210524145040.2499322-21-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210524145040.2499322-1-sashal@kernel.org> References: <20210524145040.2499322-1-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: xinhui pan [ Upstream commit 1e5c37385097c35911b0f8a0c67ffd10ee1af9a2 ] looks like we forget to set ttm->sg to NULL. Hit panic below [ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [ 1235.989074] Call Trace: [ 1235.991751] sg_free_table+0x17/0x20 [ 1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu] [ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu] [ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm] [ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm] [ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm] [ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm] [ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu] [ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu] [ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu] [ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu] Signed-off-by: xinhui pan Reviewed-by: Christian König Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index d057bc29bf4c..b84ef2295d4f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -1010,6 +1010,7 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm) if (gtt && gtt->userptr) { kfree(ttm->sg); + ttm->sg = NULL; ttm->page_flags &= ~TTM_PAGE_FLAG_SG; return; } -- 2.30.2