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 1EE27CCA47B for ; Tue, 28 Jun 2022 02:23:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243959AbiF1CXQ (ORCPT ); Mon, 27 Jun 2022 22:23:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243955AbiF1CWf (ORCPT ); Mon, 27 Jun 2022 22:22:35 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 132C025285; Mon, 27 Jun 2022 19:22:03 -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 430E2B81C12; Tue, 28 Jun 2022 02:22:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0556CC341CD; Tue, 28 Jun 2022 02:21:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656382921; bh=rOos/ArnyqrU9+/UDMZ/R2BUkprdvSdRzCRG/yD/lQ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bBczAIs825MzX6CRYQGzoLE37ery5+KW1kpHUG2AvwvjsVa0jAjW0TGjMYExCzSfd 2d/iuwTnordUhtmK6SrgvB6/Jgj23EvvJTsfjtxWz/ASsX0DLNqh/O/Vg0PpIyqiyG ltbRdOL06T8QnbZXmvhV5nlOdPuZooi8bv/UBaoKObPXM0GZ2jMMHr40g2mv/nvEfa G6c1ErlVMeGGpXLxg2wB3KfE7fRSFwnzuF9t09CHuEgIJ1DNxLAhFCt8SWGhoPadsj P0hW8TrOgBQod6zb2XOo/sDK/sG58IfUuFsQd9lCsvG/yys1F9gG9tiDugIxudXAI2 +8OvTtxO3+kig== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hyunwoo Kim , Helge Deller , Sasha Levin , yang.lee@linux.alibaba.com, yangyingliang@huawei.com, cai.huoqing@linux.dev, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write Date: Mon, 27 Jun 2022 22:20:41 -0400 Message-Id: <20220628022100.595243-22-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220628022100.595243-1-sashal@kernel.org> References: <20220628022100.595243-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org From: Hyunwoo Kim [ Upstream commit a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 ] In pxa3xx_gcu_write, a count parameter of type size_t is passed to words of type int. Then, copy_from_user() may cause a heap overflow because it is used as the third argument of copy_from_user(). Signed-off-by: Hyunwoo Kim Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- drivers/video/fbdev/pxa3xx-gcu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c index 9421d14d0eb0..9e9888e40c57 100644 --- a/drivers/video/fbdev/pxa3xx-gcu.c +++ b/drivers/video/fbdev/pxa3xx-gcu.c @@ -381,7 +381,7 @@ pxa3xx_gcu_write(struct file *file, const char *buff, struct pxa3xx_gcu_batch *buffer; struct pxa3xx_gcu_priv *priv = to_pxa3xx_gcu_priv(file); - int words = count / 4; + size_t words = count / 4; /* Does not need to be atomic. There's a lock in user space, * but anyhow, this is just for statistics. */ -- 2.35.1