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 X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B661C433DB for ; Mon, 1 Feb 2021 15:57:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5C6AD64E98 for ; Mon, 1 Feb 2021 15:57:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229763AbhBAP50 (ORCPT ); Mon, 1 Feb 2021 10:57:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229793AbhBAP5Y (ORCPT ); Mon, 1 Feb 2021 10:57:24 -0500 Received: from mail-io1-xd33.google.com (mail-io1-xd33.google.com [IPv6:2607:f8b0:4864:20::d33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEBDFC061573; Mon, 1 Feb 2021 07:56:44 -0800 (PST) Received: by mail-io1-xd33.google.com with SMTP id h11so17835786ioh.11; Mon, 01 Feb 2021 07:56:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=kcdyPTY1skmYjF1uajFrBrZyBd8/9OXciUlqQZU21U8=; b=uzQLEFhC1+ARNN6hqVIa3FQ1xYmbDBd6n80aAnHAx4MdYkelzPRroBA9AJQ0g6qqs3 jk7x6Htzbv9fooOxUmbTNvcYJ0ZtW2rRH9u3Ku57aBuItx9s4yCB1N73BTJjMBRoFI1g kyHhgKtKJ9sTrAANLdvBJ14fZeNwXfpShWQHuWrRRHM8IDqt0s4WxV/Ta+b8NuURv5m/ EUGt+SEJl+Sb9wBhHMed/erkr8hNm78soejwZHzeJU0CsnjSPF5swBHQI2321G1NB+sZ QqUpowJcAKuaW9s9XU3ZIlmWQWMbntJQGS/2PQC3+MiNNztGa0LExQuKUK8rvUPD3x5F gTEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=kcdyPTY1skmYjF1uajFrBrZyBd8/9OXciUlqQZU21U8=; b=kgz69Ookl+tvJzyt1zdBcArooFx3b5CrPLzBVTIy5xMx3WAu6x6uVEFhpodGxWx1hv 0pWOoedyq0JC3EUMck0TSV+b/C5gu/jNRIhuO+Ww1Cb4Ura3kq+7oKu+23+KtAa2PWnS XT2oaXCKheR1sDsV72dp2lyVd40+ekcyQws60jTa2U/xc5pHiCXn8wJZ/AarrnNaFMP6 aN8biztRVcaEAaaPceMxfZe/y8IsXxVofQ5iCK14eN9bB/VNvNrAbu/oat7MajYVOJhm SX7KrR3Eo3OdVJXG9CZMp/vpcsMlLMuBAIzDeMVAXd3kL1LGCgum7Pij88mJKphXCiyd OiHA== X-Gm-Message-State: AOAM533wJrXuCkkRIedSGeZY1STqQExxfVsV9VgHBK3xPMAQ5mEzoLXv 6bYQooKy65zbUh68BjHxX7tkIIS1KB9vCu2+ X-Google-Smtp-Source: ABdhPJzR64pEhc1+heg0E33szWIpaM9xLSkpXN4WnftuLWxO8guiKR5uRsSuzM9125+j6Lk8IeaEgA== X-Received: by 2002:a5d:8704:: with SMTP id u4mr12277294iom.3.1612195004270; Mon, 01 Feb 2021 07:56:44 -0800 (PST) Received: from spring-Precision-5820-Tower.cs.umn.edu ([2607:ea00:101:3c74:b4b0:f34c:770:f33f]) by smtp.gmail.com with ESMTPSA id t7sm9485796ilg.9.2021.02.01.07.56.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 01 Feb 2021 07:56:43 -0800 (PST) From: Wenjia Zhao Cc: driverfuzzing@gmail.com, Florian Tobias Schandinat , Bartlomiej Zolnierkiewicz , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] video: fbdev: fix the out-of-bounds access cr_data->bak Date: Mon, 1 Feb 2021 09:56:34 -0600 Message-Id: <1612194994-50994-1-git-send-email-driverfuzzing@gmail.com> X-Mailer: git-send-email 2.7.4 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org The size of cr_data->bak is CURSOR_SIZE/4, however the access size in the is CURSOR_SIZE in the loop. It causes the out-of-bounds access. Signed-off-by: Wenjia Zhao --- drivers/video/fbdev/via/viafbdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/video/fbdev/via/viafbdev.c b/drivers/video/fbdev/via/viafbdev.c index 22deb34..ef217cc 100644 --- a/drivers/video/fbdev/via/viafbdev.c +++ b/drivers/video/fbdev/via/viafbdev.c @@ -839,7 +839,7 @@ static int viafb_cursor(struct fb_info *info, struct fb_cursor *cursor) if (cursor->set & FB_CUR_SETSHAPE) { struct { u8 data[CURSOR_SIZE]; - u32 bak[CURSOR_SIZE / 4]; + u32 bak[CURSOR_SIZE]; } *cr_data = kzalloc(sizeof(*cr_data), GFP_ATOMIC); int size = ((cursor->image.width + 7) >> 3) * cursor->image.height; -- 2.7.4