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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 565B7C433E9 for ; Tue, 2 Mar 2021 01:40:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 207DA614A7 for ; Tue, 2 Mar 2021 01:40:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345560AbhCBBBk (ORCPT ); Mon, 1 Mar 2021 20:01:40 -0500 Received: from mail.kernel.org ([198.145.29.99]:58014 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240519AbhCASv4 (ORCPT ); Mon, 1 Mar 2021 13:51:56 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id A241A64F9E; Mon, 1 Mar 2021 17:26:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614619584; bh=GlxxVNP9rhEar+fi8jeExJM4gGoPJ386ybd4Nou0H4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XiG2DNco4ncYJp4vWEnaCALxnjpZBDTGTDWq4pzxyb2L1do3fREIUzdABNhrp+iRt HAmKwwop+9c/dA4tKTuCHbKcNRRUarD4Aii94C6dO3D7WcZzpWtXDhTcGcrMd306rq nuLpN9l07h3IWg3Tz5Cyud2KYnj/0Axoe0rn2KOA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+ec3b3128c576e109171d@syzkaller.appspotmail.com, James Reynolds , Sean Young , Mauro Carvalho Chehab Subject: [PATCH 5.10 490/663] media: mceusb: Fix potential out-of-bounds shift Date: Mon, 1 Mar 2021 17:12:18 +0100 Message-Id: <20210301161206.091782438@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161141.760350206@linuxfoundation.org> References: <20210301161141.760350206@linuxfoundation.org> User-Agent: quilt/0.66 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: James Reynolds commit 1b43bad31fb0e00f45baf5b05bd21eb8d8ce7f58 upstream. When processing a MCE_RSP_GETPORTSTATUS command, the bit index to set in ir->txports_cabled comes from response data, and isn't validated. As ir->txports_cabled is a u8, nothing should be done if the bit index is greater than 7. Cc: stable@vger.kernel.org Reported-by: syzbot+ec3b3128c576e109171d@syzkaller.appspotmail.com Signed-off-by: James Reynolds Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/rc/mceusb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/media/rc/mceusb.c +++ b/drivers/media/rc/mceusb.c @@ -1169,7 +1169,7 @@ static void mceusb_handle_command(struct switch (subcmd) { /* the one and only 5-byte return value command */ case MCE_RSP_GETPORTSTATUS: - if (buf_in[5] == 0) + if (buf_in[5] == 0 && *hi < 8) ir->txports_cabled |= 1 << *hi; break;