From patchwork Mon Mar 1 16:13:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 389847 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, 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 9DF1FC433DB for ; Mon, 1 Mar 2021 17:52:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FC01650EF for ; Mon, 1 Mar 2021 17:52:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239028AbhCARwQ (ORCPT ); Mon, 1 Mar 2021 12:52:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:34728 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238308AbhCARpo (ORCPT ); Mon, 1 Mar 2021 12:45:44 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2E139650D9; Mon, 1 Mar 2021 16:58:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614617920; bh=GlxxVNP9rhEar+fi8jeExJM4gGoPJ386ybd4Nou0H4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pQFjgkN9kRupeW/C3uEGxTsdIDtd6BCqHpcESZNY6wrUHIcW4PQur3botSV49YzRP GVgYsMEZXqcSi9/aGEPib8Nm8REkcsNzXfh20fKyzGqLigUbUW2vhvshQovmXm9ZnC iqvGaPBfPmDZlgxuW4cUnldqyrQbflFYfeGPeXwE= 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 5.4 244/340] media: mceusb: Fix potential out-of-bounds shift Date: Mon, 1 Mar 2021 17:13:08 +0100 Message-Id: <20210301161100.297368594@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161048.294656001@linuxfoundation.org> References: <20210301161048.294656001@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@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;