From patchwork Mon Jun 26 09:14:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 13292551 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 E7C4CEB64D7 for ; Mon, 26 Jun 2023 09:15:12 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 26A9910E0C3; Mon, 26 Jun 2023 09:15:08 +0000 (UTC) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id 53A7A10E0A2; Mon, 26 Jun 2023 09:15:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1687770905; x=1719306905; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=c8zPgWJY6SC59lOQdr8vPRntj39QqPiFfis3EjYD9Kg=; b=NpWE4pQGKHaCyRoScpbzDGEQkUqlMCFk6x70txO44kihzmcpjeUyvKyC tnAxwohk4l4IKvps5jCF2EINk9JAbK+0taITi65Sdxit2cGP00YczOB7P /EtrFIbPtN+uXGqxecGFXaFwu4c2VmAFuM0m2n1o4Q2UVXH8I4JiPDMIe 6lBWduCRmvBr1ZwlvxfdUBd2Q8qg+GvLD04A0nMfp1T4DPMrigEIk9dOA D5OCk6ctMGt7jfw24hdJLanPJzQ/U6HAN6Fdi0NGtBHn7niIZaVdVICRy WcEB3s5NzsBngoSmKVmA8ghwT/yP+mutM9Pj5F8B5QmN3KjZwCrqAPL1k Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10752"; a="345974079" X-IronPort-AV: E=Sophos;i="6.01,159,1684825200"; d="scan'208";a="345974079" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jun 2023 02:15:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10752"; a="781357733" X-IronPort-AV: E=Sophos;i="6.01,159,1684825200"; d="scan'208";a="781357733" Received: from ettammin-mobl1.ger.corp.intel.com (HELO thellstr-mobl1.intel.com) ([10.249.254.105]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jun 2023 02:15:02 -0700 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-xe@lists.freedesktop.org Date: Mon, 26 Jun 2023 11:14:47 +0200 Message-Id: <20230626091450.14757-2-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230626091450.14757-1-thomas.hellstrom@linux.intel.com> References: <20230626091450.14757-1-thomas.hellstrom@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v2 1/4] drm/ttm: Fix ttm_lru_bulk_move_pos_tail() 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: =?utf-8?q?Thomas_Hellstr=C3=B6m?= , Daniel Vetter , intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, dri-devel@lists.freedesktop.org, =?utf-8?q?Christian_K=C3=B6nig?= , =?utf-8?q?Christian_K=C3=B6nig?= Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" The value of pos->first was not updated when the first resource of the range was moved. This could lead to errors like the one below. Fix this by updating pos->first when needed. <3> [218.963342] BUG: KASAN: null-ptr-deref in ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.963456] Read of size 8 at addr 0000000000000038 by task xe_evict/1529 <3> [218.963546] <3> [218.963566] CPU: 0 PID: 1529 Comm: xe_evict Not tainted 6.3.0-xe #1 <3> [218.963664] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake H DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.4064.A00.2102041619 02/04/2021 <3> [218.963841] Call Trace: <3> [218.963881] <3> [218.963915] dump_stack_lvl+0x64/0xb0 <3> [218.963976] print_report+0x3e5/0x600 <3> [218.964036] ? ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.964127] kasan_report+0x96/0xc0 <3> [218.964183] ? ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.964276] ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.964365] ttm_bo_set_bulk_move+0x92/0x140 [ttm] <3> [218.964454] xe_gem_object_close+0xc8/0x120 [xe] <3> [218.964675] ? __pfx_xe_gem_object_close+0x10/0x10 [xe] <3> [218.964908] ? drm_gem_object_handle_put_unlocked+0xc7/0x170 [drm] <3> [218.965071] drm_gem_object_release_handle+0x45/0x80 [drm] <3> [218.965220] ? __pfx_drm_gem_object_release_handle+0x10/0x10 [drm] <3> [218.965381] idr_for_each+0xc9/0x180 <3> [218.965437] ? __pfx_idr_for_each+0x10/0x10 <3> [218.965504] drm_gem_release+0x20/0x30 [drm] <3> [218.965637] drm_file_free.part.0+0x4cb/0x4f0 [drm] <3> [218.965778] ? drm_close_helper.isra.0+0xb7/0xe0 [drm] <3> [218.965921] drm_release_noglobal+0x49/0x90 [drm] <3> [218.966061] __fput+0x122/0x450 <3> [218.966115] task_work_run+0xfe/0x190 <3> [218.966175] ? __pfx_task_work_run+0x10/0x10 <3> [218.966239] ? do_raw_spin_unlock+0xa7/0x140 <3> [218.966308] do_exit+0x55f/0x1430 <3> [218.966364] ? __pfx_lock_release+0x10/0x10 <3> [218.966431] ? do_raw_spin_lock+0x11d/0x1e0 <3> [218.966498] ? __pfx_do_exit+0x10/0x10 <3> [218.966554] ? __pfx_do_raw_spin_lock+0x10/0x10 <3> [218.966625] ? mark_held_locks+0x24/0x90 <3> [218.966688] ? lockdep_hardirqs_on_prepare+0x136/0x210 <3> [218.966768] do_group_exit+0x68/0x110 <3> [218.966828] __x64_sys_exit_group+0x2c/0x30 <3> [218.966896] do_syscall_64+0x3c/0x90 <3> [218.966955] entry_SYSCALL_64_after_hwframe+0x72/0xdc <3> [218.967035] RIP: 0033:0x7f77b194f146 <3> [218.967094] Code: Unable to access opcode bytes at 0x7f77b194f11c. <3> [218.967174] RSP: 002b:00007ffc64791188 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 <3> [218.967271] RAX: ffffffffffffffda RBX: 00007f77b1a548a0 RCX: 00007f77b194f146 <3> [218.967364] RDX: 0000000000000062 RSI: 000000000000003c RDI: 0000000000000062 <3> [218.967458] RBP: 0000000000000062 R08: 00000000000000e7 R09: ffffffffffffff78 <3> [218.967553] R10: 0000000000000058 R11: 0000000000000246 R12: 00007f77b1a548a0 <3> [218.967648] R13: 0000000000000003 R14: 00007f77b1a5d2e8 R15: 0000000000000000 <3> [218.967745] Fixes: fee2ede15542 ("drm/ttm: rework bulk move handling v5") Cc: "Christian König" Cc: "Christian König" Cc: Daniel Vetter Cc: dri-devel@lists.freedesktop.org Cc: # v5.19+ Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/411 Signed-off-by: Thomas Hellström --- drivers/gpu/drm/ttm/ttm_resource.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c index 7333f7a87a2f..cb05e0a36576 100644 --- a/drivers/gpu/drm/ttm/ttm_resource.c +++ b/drivers/gpu/drm/ttm/ttm_resource.c @@ -86,6 +86,8 @@ static void ttm_lru_bulk_move_pos_tail(struct ttm_lru_bulk_move_pos *pos, struct ttm_resource *res) { if (pos->last != res) { + if (pos->first == res) + pos->first = list_next_entry(res, lru); list_move(&res->lru, &pos->last->lru); pos->last = res; }