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=unavailable 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 77D0DC433DF for ; Thu, 18 Jun 2020 01:46:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 466422073E for ; Thu, 18 Jun 2020 01:46:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592444775; bh=aKjmy7E+bzZw3tUV8J+P3Mn4Gqs8+hbgdrY6IkG13cQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h6/HjT3ORZE7M/rsw90c+QsdeRraXppGU91auvBxsQ4RvDUxhwX8F01yWCmWr1MHK gA1EW2+uePVLmP4z1mOpIUB1ge+IH0Je9YW/+LWQpSE3DQbtvKCYJ1jDiGhFrylbvH pXErp+jpiwDD3Ysc8W90Aw8tWyjjINcKxp2ZsC1I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732376AbgFRBqO (ORCPT ); Wed, 17 Jun 2020 21:46:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:37260 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731475AbgFRB2b (ORCPT ); Wed, 17 Jun 2020 21:28:31 -0400 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 82C842220C; Thu, 18 Jun 2020 01:28:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592443711; bh=aKjmy7E+bzZw3tUV8J+P3Mn4Gqs8+hbgdrY6IkG13cQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rFKG4g/ssvhFVdF1z4hNWKhxKVn9X+fmbAsghVt1f5uVPThc1abekEx3ToP7NHltU qP5jhtRq9QcADMhkFYcd0V+xanVEX3RpE5y43VyzVC2pV3jS1/fzKid6qorvdU1DOf Xzc6CWbkTsAsYHjBuMgtaJd1hWmLnqm31zH4ju/A= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dan Carpenter , Takashi Iwai , Sasha Levin , alsa-devel@alsa-project.org Subject: [PATCH AUTOSEL 4.9 09/80] ALSA: isa/wavefront: prevent out of bounds write in ioctl Date: Wed, 17 Jun 2020 21:27:08 -0400 Message-Id: <20200618012819.609778-9-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618012819.609778-1-sashal@kernel.org> References: <20200618012819.609778-1-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: Dan Carpenter [ Upstream commit 7f0d5053c5a9d23fe5c2d337495a9d79038d267b ] The "header->number" comes from the ioctl and it needs to be clamped to prevent out of bounds writes. Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/20200501094011.GA960082@mwanda Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/isa/wavefront/wavefront_synth.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c index 718d5e3b7806..6c06d0645779 100644 --- a/sound/isa/wavefront/wavefront_synth.c +++ b/sound/isa/wavefront/wavefront_synth.c @@ -1174,7 +1174,10 @@ wavefront_send_alias (snd_wavefront_t *dev, wavefront_patch_info *header) "alias for %d\n", header->number, header->hdr.a.OriginalSample); - + + if (header->number >= WF_MAX_SAMPLE) + return -EINVAL; + munge_int32 (header->number, &alias_hdr[0], 2); munge_int32 (header->hdr.a.OriginalSample, &alias_hdr[2], 2); munge_int32 (*((unsigned int *)&header->hdr.a.sampleStartOffset), @@ -1205,6 +1208,9 @@ wavefront_send_multisample (snd_wavefront_t *dev, wavefront_patch_info *header) int num_samples; unsigned char *msample_hdr; + if (header->number >= WF_MAX_SAMPLE) + return -EINVAL; + msample_hdr = kmalloc(WF_MSAMPLE_BYTES, GFP_KERNEL); if (! msample_hdr) return -ENOMEM; -- 2.25.1