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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F7E1CCA47F for ; Tue, 19 Jul 2022 12:58:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242425AbiGSM6P (ORCPT ); Tue, 19 Jul 2022 08:58:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40996 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242351AbiGSM5K (ORCPT ); Tue, 19 Jul 2022 08:57:10 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4A495C96B; Tue, 19 Jul 2022 05:23:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A0872B81B1C; Tue, 19 Jul 2022 12:23:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 019CEC341C6; Tue, 19 Jul 2022 12:23:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658233382; bh=1hAtghOKEH8FSD8tecwcdFljb7QXypnWi+WQSL/Z5Lg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YiNB1Hh7LdxY1Q/jd6Wh2+wbjdZY6i9riteKen3WXB1wCXH/dTolbxiy6kGPgSq8f nIOBi/VGH+vlbE5/ahAIteDrIFB8xoqG65JWg5LlbydSsDKmSY18WYd2LhoYTzqp1w 6NYwwmpmxvoADJvx0AirgoyyXFhD2qiRZdzdqxl0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrzej Hajda , Andi Shyti , Rodrigo Vivi , Sasha Levin Subject: [PATCH 5.18 104/231] drm/i915/selftests: fix subtraction overflow bug Date: Tue, 19 Jul 2022 13:53:09 +0200 Message-Id: <20220719114723.384437849@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220719114714.247441733@linuxfoundation.org> References: <20220719114714.247441733@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrzej Hajda [ Upstream commit 333991c4e66b3d4b5613315f18016da80344f659 ] On some machines hole_end can be small enough to cause subtraction overflow. On the other side (addr + 2 * min_alignment) can overflow in case of mock tests. This patch should handle both cases. Fixes: e1c5f754067b59 ("drm/i915: Avoid overflow in computing pot_hole loop termination") Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3674 Signed-off-by: Andrzej Hajda Reviewed-by: Andi Shyti Signed-off-by: Andi Shyti Link: https://patchwork.freedesktop.org/patch/msgid/20220624113528.2159210-1-andrzej.hajda@intel.com Signed-off-by: Rodrigo Vivi (cherry picked from commit ab3edc679c552a466e4bf0b11af3666008bd65a2) Signed-off-by: Rodrigo Vivi Signed-off-by: Sasha Levin --- drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index ab751192eb3b..34d1ef015233 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -742,7 +742,7 @@ static int pot_hole(struct i915_address_space *vm, u64 addr; for (addr = round_up(hole_start + min_alignment, step) - min_alignment; - addr <= round_down(hole_end - (2 * min_alignment), step) - min_alignment; + hole_end > addr && hole_end - addr >= 2 * min_alignment; addr += step) { err = i915_vma_pin(vma, 0, 0, addr | flags); if (err) { -- 2.35.1