Message ID | 20230801215538.105255-1-astrajoan@yahoo.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <intel-gfx-bounces@lists.freedesktop.org> 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 97BCCC001DF for <intel-gfx@archiver.kernel.org>; Wed, 2 Aug 2023 10:01:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 21FB910E533; Wed, 2 Aug 2023 10:01:58 +0000 (UTC) Received: from mgamail.intel.com (unknown [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTPS id A1FAE10E54B for <intel-gfx@lists.freedesktop.org>; Wed, 2 Aug 2023 10:01:56 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6600,9927,10789"; a="400485979" X-IronPort-AV: E=Sophos;i="6.01,248,1684825200"; d="scan'208";a="400485979" Received: from 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Hermes SMTP Server) with ESMTPA ID 2133038380f997b8027ffd392dd22e8f; Tue, 01 Aug 2023 21:55:44 +0000 (UTC) From: Ziqi Zhao <astrajoan@yahoo.com> To: syzbot+622bba18029bcde672e1@syzkaller.appspotmail.com, astrajoan@yahoo.com, jani.nikula@linux.intel.com, airlied@gmail.com, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, ivan.orlov0322@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, skhan@linuxfoundation.org, tzimmermann@suse.de Date: Tue, 1 Aug 2023 14:55:38 -0700 Message-Id: <20230801215538.105255-1-astrajoan@yahoo.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <00000000000034cf5d05fea52dd4@google.com> References: <00000000000034cf5d05fea52dd4@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TUID: lRZolwnOOqd3 Subject: [Intel-gfx] [PATCH v2] drm/modes: Fix division by zero error X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development <intel-gfx.lists.freedesktop.org> List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/intel-gfx>, <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe> List-Archive: <https://lists.freedesktop.org/archives/intel-gfx> List-Post: <mailto:intel-gfx@lists.freedesktop.org> List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help> List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/intel-gfx>, <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe> Cc: netdev@vger.kernel.org, dsahern@kernel.org, syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, edumazet@google.com, jiri@nvidia.com, jacob.e.keller@intel.com, kuba@kernel.org, pabeni@redhat.com, davem@davemloft.net Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org> |
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[v2] drm/modes: Fix division by zero error
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diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index ac9a406250c5..137101960690 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -1285,13 +1285,13 @@ EXPORT_SYMBOL(drm_mode_set_name); */ int drm_mode_vrefresh(const struct drm_display_mode *mode) { - unsigned int num, den; + u64 num, den; if (mode->htotal == 0 || mode->vtotal == 0) return 0; - num = mode->clock; - den = mode->htotal * mode->vtotal; + num = mul_u32_u32(mode->clock, 1000); + den = mul_u32_u32(mode->htotal, mode->vtotal); if (mode->flags & DRM_MODE_FLAG_INTERLACE) num *= 2; @@ -1300,7 +1300,10 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode) if (mode->vscan > 1) den *= mode->vscan; - return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den); + if (unlikely(den > UINT_MAX)) + return DIV64_U64_ROUND_CLOSEST(num, den); + + return DIV_ROUND_CLOSEST_ULL(num, (u32) den); } EXPORT_SYMBOL(drm_mode_vrefresh);
In the bug reported by Syzbot, the variable `den == (1 << 22)` and `mode->vscan == (1 << 10)`, causing the multiplication to overflow and accidentally make `den == 0`. To prevent any chance of overflow, we replace `num` and `den` with 64-bit unsigned integers, and explicitly check if the divisor `den` will overflow. If so, we employ full 64-bit division with rounding; otherwise we keep the 64-bit to 32-bit division that could potentially be better optimized. In order to minimize the performance overhead, the overflow check for `den` is wrapped with an `unlikely` condition. Please let me know if this usage is appropriate. Reported-by: syzbot+622bba18029bcde672e1@syzkaller.appspotmail.com Signed-off-by: Ziqi Zhao <astrajoan@yahoo.com> --- V1 -> V2: address style comments suggested by Jani Nikula <jani.nikula@linux.intel.com> drivers/gpu/drm/drm_modes.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)