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 10121CCA47F for ; Tue, 28 Jun 2022 02:30:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244867AbiF1C37 (ORCPT ); Mon, 27 Jun 2022 22:29:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244880AbiF1C2Q (ORCPT ); Mon, 27 Jun 2022 22:28:16 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF46D252B4; Mon, 27 Jun 2022 19:27:16 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 6DE8C6192D; Tue, 28 Jun 2022 02:27:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB3B7C341CA; Tue, 28 Jun 2022 02:27:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656383235; bh=VttBdWDUBl9A3RqWXWoax22uYxYPC+6gtQNYnwCFaz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J6LMcpc7hH0Nl+FZ6U9hMeJFp5fSLRrIby8pV2w++KjqKs1QyjDy0tNSBQpbayUaU luWO7eJcoo8z5NXyctqNaprOWOPdI/Nzl2qgjVopiHaLpQo2UmhX5TSnzA/YnGjKRp /Tftko6ayWWYb7V8r3CMO1F0B7WQEGj592BJDFAO6mpxwjjvL+sd4I1l2o+rdsIhtK wQIqI2raYFk3PgFzqR/BMRl1u5z2lVu6NpTAuqUS63tv5HGgc6bXlF/8Te7J32/pdI jVh4uw/0wxeZgkyhqxPmuZYbyC2sqX9wh1bBySkAXfCkOn/RtrJZxX/Za49jbTCbFG U6VesoVEfhGgQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hyunwoo Kim , Helge Deller , Sasha Levin , yangyingliang@huawei.com, yang.lee@linux.alibaba.com, cai.huoqing@linux.dev, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.9 07/13] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write Date: Mon, 27 Jun 2022 22:26:51 -0400 Message-Id: <20220628022657.597208-7-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220628022657.597208-1-sashal@kernel.org> References: <20220628022657.597208-1-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 184773b6b9e4..2cca4b763d8d 100644 --- a/drivers/video/fbdev/pxa3xx-gcu.c +++ b/drivers/video/fbdev/pxa3xx-gcu.c @@ -391,7 +391,7 @@ 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