From patchwork Wed Jun 20 11:24:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10477063 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 61F83600F6 for ; Wed, 20 Jun 2018 11:25:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5123A28EAC for ; Wed, 20 Jun 2018 11:25:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4FC5E28E0C; Wed, 20 Jun 2018 11:25:07 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B45A228E0C for ; Wed, 20 Jun 2018 11:25:05 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 11EC56E467; Wed, 20 Jun 2018 11:25:05 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3EDD16E467 for ; Wed, 20 Jun 2018 11:25:03 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 12103940-1500050 for multiple; Wed, 20 Jun 2018 12:24:48 +0100 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Wed, 20 Jun 2018 12:24:48 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Wed, 20 Jun 2018 12:24:41 +0100 Message-Id: <20180620112441.13085-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.18.0.rc2 In-Reply-To: <20180620110907.pnr5zrqmsko4cyvy@kili.mountain> References: <20180620110907.pnr5zrqmsko4cyvy@kili.mountain> X-Originating-IP: 78.156.65.138 X-Country: code=GB country="United Kingdom" ip=78.156.65.138 Subject: [Intel-gfx] [PATCH] drm/i915/selftests: Avoid ERR_PTR dereference X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mika Kuoppala MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP Along the early error path for igt_switch_to_kernel_context we may try to dereference an invalid error pointer. Instead, return early rather than dump the GEM trace since we haven't yet emitted anything of interest. Reported-by: Dan Carpenter Fixes: 09a4c02e58c1 ("drm/i915: Look for an active kernel context before switching") Signed-off-by: Chris Wilson Cc: Mika Kuoppala Cc: Joonas Lahtinen Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/selftests/i915_gem_context.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/selftests/i915_gem_context.c index 836f1af8b833..90c3c36173ba 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_context.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_context.c @@ -519,8 +519,8 @@ static int igt_switch_to_kernel_context(void *arg) mutex_lock(&i915->drm.struct_mutex); ctx = kernel_context(i915); if (IS_ERR(ctx)) { - err = PTR_ERR(ctx); - goto out_unlock; + mutex_unlock(&i915->drm.struct_mutex); + return PTR_ERR(ctx); } /* First check idling each individual engine */