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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 A64D0C2BA83 for ; Fri, 14 Feb 2020 17:48:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72C7D206B6 for ; Fri, 14 Feb 2020 17:48:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581702539; bh=H1Pl5C7u+IIKGTxmcgLvipyZTnbCfoWKS0ajJ064jvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=c3yshHbAZYDrGGm4ZlOVvfyuwaUqFkRe4MtSm6IHqgJ4Em9Jqwzp+Y+tB5biesy+s sRa7nsQwXdbrxNK2c+NmERmG8AA+30/Pd5G8ld3HMbWM1teeRfWkAma3CvfNZS9HEA ldj68niORBHf/Imma5lMGNh0JaJIn11kLxj60jxI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388931AbgBNP7a (ORCPT ); Fri, 14 Feb 2020 10:59:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:44266 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388922AbgBNP73 (ORCPT ); Fri, 14 Feb 2020 10:59:29 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C257F2467C; Fri, 14 Feb 2020 15:59:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581695968; bh=H1Pl5C7u+IIKGTxmcgLvipyZTnbCfoWKS0ajJ064jvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KITeqqcW54FlHbINrJWEszTvBsF6ALyqQtEVa71nxYeDQA54D0ZuETtw8y0CJPPzL KE1ztewzrLOzOW+6Ey2EGgEjfs/hcRssBqqzBNGoL51WbvWAfWjwBfgo4savel1ucA 6KCSdLn+sWcAqpdoESS7OCxqBLFcL/iQKz1JTmkU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Gustavo A. R. Silva" , Tetsuo Handa , Eric Biggers , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH AUTOSEL 5.5 496/542] char: hpet: Fix out-of-bounds read bug Date: Fri, 14 Feb 2020 10:48:08 -0500 Message-Id: <20200214154854.6746-496-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214154854.6746-1-sashal@kernel.org> References: <20200214154854.6746-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Gustavo A. R. Silva" [ Upstream commit 98c49f1746ac44ccc164e914b9a44183fad09f51 ] Currently, there is an out-of-bounds read on array hpetp->hp_dev in the following for loop: 870 for (i = 0; i < hdp->hd_nirqs; i++) 871 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i]; This is due to the recent change from one-element array to flexible-array member in struct hpets: 104 struct hpets { ... 113 struct hpet_dev hp_dev[]; 114 }; This change affected the total size of the dynamic memory allocation, decreasing it by one time the size of struct hpet_dev. Fix this by adjusting the allocation size when calling struct_size(). Fixes: 987f028b8637c ("char: hpet: Use flexible-array member") Signed-off-by: Gustavo A. R. Silva Signed-off-by: Tetsuo Handa Acked-by: Eric Biggers Link: https://lore.kernel.org/r/20200129022613.GA24281@embeddedor.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/char/hpet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index aed2c45f7968c..ed3b7dab678db 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -855,7 +855,7 @@ int hpet_alloc(struct hpet_data *hdp) return 0; } - hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs - 1), + hpetp = kzalloc(struct_size(hpetp, hp_dev, hdp->hd_nirqs), GFP_KERNEL); if (!hpetp) -- 2.20.1