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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 28700C4338F for ; Fri, 30 Jul 2021 21:44:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 12D9060F46 for ; Fri, 30 Jul 2021 21:44:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230303AbhG3VoX (ORCPT ); Fri, 30 Jul 2021 17:44:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39254 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229997AbhG3VoX (ORCPT ); Fri, 30 Jul 2021 17:44:23 -0400 Received: from mail-lj1-x235.google.com (mail-lj1-x235.google.com [IPv6:2a00:1450:4864:20::235]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2044BC06175F; Fri, 30 Jul 2021 14:44:17 -0700 (PDT) Received: by mail-lj1-x235.google.com with SMTP id h9so14318427ljq.8; Fri, 30 Jul 2021 14:44:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=iUWsYGbYRvDKidtDFAD37LhSTu0mAAw/UZoF5BX5je4=; b=OBxPLbMIP9Zg1tCsP+gAveHb7Z/9qmetZxjEySQkmkZVrdOtfdVFg9vR/2s0vrE7DJ G4Y0G7XB7bsR6NcAgROrFQwttHTY69EXUww9skhLiR5Ku/WZCTgtjHknOKmDg4IiahMC i+tawWXEKt0K+gQw0otdQKclH++pyPaMd3vxryxAwIirSEPOt/Y1AcwOTvn3Z+5vkpga aj6I0mprZrERwbxMRtiO9f+kz5/A+cvg6gTqXW3Q4NLZxQ9WVs6HXLd4gpXceCpRnIPJ sZXx8GtiqDzZkQM86doOwKekydU+wTRpSBdhOQc99y5m83gJASGOX0mjzRnjRYSSgd8B F7CA== 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:mime-version :content-transfer-encoding; bh=iUWsYGbYRvDKidtDFAD37LhSTu0mAAw/UZoF5BX5je4=; b=a90sbxe2qyUAU3g5EwalWSp3xt38EyOH9ei7WNWL9yMdz8RqXM4C/+fako/19BKdXT NJgocqhgBzbwF9/90KTmGjXPAqhYdoJbewJXprW0u15JAfjshmalFFDOwlOxgOaHrhDe ZYVLGVWnCezaBGg0+QxZc8A0Y2ZaMfIT3QtLzvgrrgiYBuMLLJUeJDoowZX20eY0Zgzl Zkx+H61fEmeVrh8Xo8JQLF3vr0CFylv+vLpIa83ivCRNGW9TCFkdx/h+hkbvTwGg4DPu J02UZKm3m61wLyfO52EyjTtl7JNdTvedIbFKG1pHoSMONy6IdPx/JHZEFD7sPkU0095e f2Ww== X-Gm-Message-State: AOAM530x3MIORUg3oQoUaNdsg64/qIvd470h0C/vVbOXNtq9ABDJd2j9 IcE+jRHMesW1Cj2McRdCkfc= X-Google-Smtp-Source: ABdhPJx/siIPONhywOb1T7C7lk6QtoW4/5xKjW34rQU/7G6Jr2RCrRQRgPnwO1B6wzgDxNa7PZHQUQ== X-Received: by 2002:a05:651c:b06:: with SMTP id b6mr3027530ljr.171.1627681455465; Fri, 30 Jul 2021 14:44:15 -0700 (PDT) Received: from localhost.localdomain ([94.103.227.213]) by smtp.gmail.com with ESMTPSA id d18sm175512ljc.64.2021.07.30.14.44.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jul 2021 14:44:15 -0700 (PDT) From: Pavel Skripkin To: petkan@nucleusys.com, davem@davemloft.net, kuba@kernel.org Cc: linux-usb@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin , syzbot+02c9f70f3afae308464a@syzkaller.appspotmail.com Subject: [PATCH] net: pegasus: fix uninit-value in get_interrupt_interval Date: Sat, 31 Jul 2021 00:44:11 +0300 Message-Id: <20210730214411.1973-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Syzbot reported uninit value pegasus_probe(). The problem was in missing error handling. get_interrupt_interval() internally calls read_eprom_word() which can fail in some cases. For example: failed to receive usb control message. These cases should be handled to prevent uninit value bug, since read_eprom_word() will not initialize passed stack variable in case of internal failure. Fail log: BUG: KMSAN: uninit-value in get_interrupt_interval drivers/net/usb/pegasus.c:746 [inline] BUG: KMSAN: uninit-value in pegasus_probe+0x10e7/0x4080 drivers/net/usb/pegasus.c:1152 CPU: 1 PID: 825 Comm: kworker/1:1 Not tainted 5.12.0-rc6-syzkaller #0 ... Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x24c/0x2e0 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197 get_interrupt_interval drivers/net/usb/pegasus.c:746 [inline] pegasus_probe+0x10e7/0x4080 drivers/net/usb/pegasus.c:1152 .... Local variable ----data.i@pegasus_probe created at: get_interrupt_interval drivers/net/usb/pegasus.c:1151 [inline] pegasus_probe+0xe57/0x4080 drivers/net/usb/pegasus.c:1152 get_interrupt_interval drivers/net/usb/pegasus.c:1151 [inline] pegasus_probe+0xe57/0x4080 drivers/net/usb/pegasus.c:1152 Reported-and-tested-by: syzbot+02c9f70f3afae308464a@syzkaller.appspotmail.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Pavel Skripkin --- drivers/net/usb/pegasus.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c index 9a907182569c..bc2dbf86496b 100644 --- a/drivers/net/usb/pegasus.c +++ b/drivers/net/usb/pegasus.c @@ -735,12 +735,16 @@ static inline void disable_net_traffic(pegasus_t *pegasus) set_registers(pegasus, EthCtrl0, sizeof(tmp), &tmp); } -static inline void get_interrupt_interval(pegasus_t *pegasus) +static inline int get_interrupt_interval(pegasus_t *pegasus) { u16 data; u8 interval; + int ret; + + ret = read_eprom_word(pegasus, 4, &data); + if (ret < 0) + return ret; - read_eprom_word(pegasus, 4, &data); interval = data >> 8; if (pegasus->usb->speed != USB_SPEED_HIGH) { if (interval < 0x80) { @@ -755,6 +759,8 @@ static inline void get_interrupt_interval(pegasus_t *pegasus) } } pegasus->intr_interval = interval; + + return 0; } static void set_carrier(struct net_device *net) @@ -1149,7 +1155,9 @@ static int pegasus_probe(struct usb_interface *intf, | NETIF_MSG_PROBE | NETIF_MSG_LINK); pegasus->features = usb_dev_id[dev_index].private; - get_interrupt_interval(pegasus); + res = get_interrupt_interval(pegasus); + if (res) + goto out2; if (reset_mac(pegasus)) { dev_err(&intf->dev, "can't reset MAC\n"); res = -EIO; -- 2.32.0