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=-15.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 26CE8C433EF for ; Tue, 21 Sep 2021 19:33:17 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id DF77861159 for ; Tue, 21 Sep 2021 19:33:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org DF77861159 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1B74E6E931; Tue, 21 Sep 2021 19:33:14 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6F3136E5D4; Tue, 21 Sep 2021 19:33:12 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10114"; a="223482686" X-IronPort-AV: E=Sophos;i="5.85,311,1624345200"; d="scan'208";a="223482686" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2021 12:33:10 -0700 X-IronPort-AV: E=Sophos;i="5.85,311,1624345200"; d="scan'208";a="703238534" Received: from jons-linux-dev-box.fm.intel.com (HELO jons-linux-dev-box) ([10.1.27.20]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2021 12:33:10 -0700 Date: Tue, 21 Sep 2021 12:28:14 -0700 From: Matthew Brost To: John Harrison Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, daniel.vetter@ffwll.ch, tony.ye@intel.com, zhengguo.xu@intel.com Subject: Re: [Intel-gfx] [PATCH 19/27] drm/i915: Fix bug in user proto-context creation that leaked contexts Message-ID: <20210921192814.GA5223@jons-linux-dev-box> References: <20210820224446.30620-1-matthew.brost@intel.com> <20210820224446.30620-20-matthew.brost@intel.com> <008b1b3f-9aa8-fe64-a967-091f7170ded1@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <008b1b3f-9aa8-fe64-a967-091f7170ded1@intel.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Mon, Sep 20, 2021 at 03:57:06PM -0700, John Harrison wrote: > On 8/20/2021 15:44, Matthew Brost wrote: > > Set number of engines before attempting to create contexts so the > > function free_engines can clean up properly. > > > > Fixes: d4433c7600f7 ("drm/i915/gem: Use the proto-context to handle create parameters (v5)") > > Signed-off-by: Matthew Brost > > Cc: > > --- > > drivers/gpu/drm/i915/gem/i915_gem_context.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c > > index dbaeb924a437..bcaaf514876b 100644 > > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c > > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c > > @@ -944,6 +944,7 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx, > > unsigned int n; > > e = alloc_engines(num_engines); > This can return null when out of memory. There needs to be an early exit > check before dereferencing a null pointer. Not sure if that is a worse bug > or not than leaking memory! Either way, it would be good to fix that too. > Indeed there is another bug. Will fix that one too. Matt > John. > > > + e->num_engines = num_engines; > > for (n = 0; n < num_engines; n++) { > > struct intel_context *ce; > > int ret; > > @@ -977,7 +978,6 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx, > > goto free_engines; > > } > > } > > - e->num_engines = num_engines; > > return e; >