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 EAC3EC32771 for ; Mon, 26 Sep 2022 10:16:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234350AbiIZKQ3 (ORCPT ); Mon, 26 Sep 2022 06:16:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235100AbiIZKPe (ORCPT ); Mon, 26 Sep 2022 06:15:34 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06CF748E9F; Mon, 26 Sep 2022 03:14:27 -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 A780960B60; Mon, 26 Sep 2022 10:14:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2904C433C1; Mon, 26 Sep 2022 10:14:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664187266; bh=VttBdWDUBl9A3RqWXWoax22uYxYPC+6gtQNYnwCFaz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CiqA2Q5YJMuRcdHpfcKp3urIfflm4l0eNAg7TTFCGvIJijQlzAXQl+fIly3uQddno 9lrF+haniKQ9Tn6mpi7g8V1q6Cm0hkIN9mx0z3BKeYkzqAYMIZAGFzWHv5TYyQsPSX Wp1+wd9qXCm9ZUmbCjmf42d78sz2pDzqUWhJOrCg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hyunwoo Kim , Helge Deller , Sasha Levin Subject: [PATCH 4.9 06/30] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write Date: Mon, 26 Sep 2022 12:11:37 +0200 Message-Id: <20220926100736.370084852@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220926100736.153157100@linuxfoundation.org> References: <20220926100736.153157100@linuxfoundation.org> User-Agent: quilt/0.67 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: 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