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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 2BFF3C4338F for ; Tue, 24 Aug 2021 15:07:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06404610CD for ; Tue, 24 Aug 2021 15:07:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238200AbhHXPIg (ORCPT ); Tue, 24 Aug 2021 11:08:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238198AbhHXPIf (ORCPT ); Tue, 24 Aug 2021 11:08:35 -0400 Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C9E8C061764 for ; Tue, 24 Aug 2021 08:07:51 -0700 (PDT) Received: by mail-pj1-x102b.google.com with SMTP id om1-20020a17090b3a8100b0017941c44ce4so1982714pjb.3 for ; Tue, 24 Aug 2021 08:07:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=itfac-mrt-ac-lk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=CrvJVyQNbZShLMemqxYoBqBYQ2Gzkms2NEqpFCTxgFg=; b=GG4p17qQULEkXmJuULN17D8CN5s5hbWcjAhzTs+yEw4sfqEOoxK69v/ddJeJFi9F8l nRr3VMWv1O0I/shDr6IAwuZRtAgcbJLsXH8qf7uzcFE8LHl5FJdyOh+SwWYNYvgaEG7j j+0UhS8FdDrf18ODv46GBM8Ar3oaL/LsDUZkl4i7XXAUt+kPpX+e5D5+Cs5zKaKUgrGU LZ243AZhx8QhYfqM1+gi3U1VdcQo6LDT9n1mEjFJsv16BtbKE/FOpqdexMj7RwT6gFN7 WaGKuAtV33XawCfgRyynhAqjmRJOblIB+jhuxJsBJDuqie7+igJzw/leNshOIvgiJfZi HaCA== 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:in-reply-to :references; bh=CrvJVyQNbZShLMemqxYoBqBYQ2Gzkms2NEqpFCTxgFg=; b=Sy06UP/TxNX3FQjyzuwp7YI5uRRzhr3r6pk299J1lCRksljrRIYOweAnUfh0D+E+Ew SmwgODEOra3K2erqNstlnu4oYfyXQJ74iSb9BjMF+UStdw0npRVahGcNjuVe+UadYWq3 U9wR7oAQBzBSSdYrnFG+IMdBaHxjeKb65U/1QH3xGwjJNrO+9UYJmbiFWSB94mGMsp+n y9aogJh5QvkVmpX3rU4JU1rMIoULDw6fGrCL4ijZDRomA+USTmDO09SCzo+BrVYjaS28 akM2o3btomcOARtjnzE6oMwLOkE3IOcGxaIjpxjNdPrCLpPN93/oqd5tNEEswEbCici5 MVeg== X-Gm-Message-State: AOAM530O8cDdWsxQ8fRs2mN8F57kNzjp/IVkoHrL1C8G1khSbjne3rSS a9m/hXbrLxqrAUC2an1ukRCK X-Google-Smtp-Source: ABdhPJzlUc2kfz5lNrVZPHUeOBMRtjZxhr1snXZ66Z5Oy/f4K6sIuxQmhHNRYkNeqRJMPY/QF1SD5w== X-Received: by 2002:a17:902:c40e:b029:12c:cbce:2d18 with SMTP id k14-20020a170902c40eb029012ccbce2d18mr33623315plk.60.1629817670545; Tue, 24 Aug 2021 08:07:50 -0700 (PDT) Received: from localhost.localdomain ([175.157.61.62]) by smtp.gmail.com with ESMTPSA id y12sm23800336pgk.7.2021.08.24.08.07.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Aug 2021 08:07:50 -0700 (PDT) From: "F.A.Sulaiman" To: jikos@kernel.org, benjamin.tissoires@redhat.com Cc: "F.A.Sulaiman" , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, paskripkin@gmail.com Subject: [PATCH v3] HID: betop: fix slab-out-of-bounds Write in betop_probe Date: Tue, 24 Aug 2021 20:37:30 +0530 Message-Id: <20210824150730.9118-1-asha.16@itfac.mrt.ac.lk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210816201544.26405-1-asha.16@itfac.mrt.ac.lk> References: <20210816201544.26405-1-asha.16@itfac.mrt.ac.lk> Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Syzbot reported slab-out-of-bounds Write bug in hid-betopff driver. The problem is the driver assumes the device must have an input report but some malicious devices violate this assumption. So this patch checks hid_device's input is non empty before it's been used. Reported-by: syzbot+07efed3bc5a1407bd742@syzkaller.appspotmail.com Signed-off-by: F.A. SULAIMAN --- drivers/hid/hid-betopff.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-betopff.c b/drivers/hid/hid-betopff.c index 0790fbd3fc9a..467d789f9bc2 100644 --- a/drivers/hid/hid-betopff.c +++ b/drivers/hid/hid-betopff.c @@ -56,15 +56,22 @@ static int betopff_init(struct hid_device *hid) { struct betopff_device *betopff; struct hid_report *report; - struct hid_input *hidinput = - list_first_entry(&hid->inputs, struct hid_input, list); + struct hid_input *hidinput; struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; - struct input_dev *dev = hidinput->input; + struct input_dev *dev; int field_count = 0; int error; int i, j; + if (list_empty(&hid->inputs)) { + hid_err(hid, "no inputs found\n"); + return -ENODEV; + } + + hidinput = list_first_entry(&hid->inputs, struct hid_input, list); + dev = hidinput->input; + if (list_empty(report_list)) { hid_err(hid, "no output reports found\n"); return -ENODEV; -- 2.17.1