From patchwork Mon Apr 5 19:57:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 415539 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=-15.7 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=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 309F6C43460 for ; Mon, 5 Apr 2021 19:58:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F3BCA61041 for ; Mon, 5 Apr 2021 19:58:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240268AbhDET6o (ORCPT ); Mon, 5 Apr 2021 15:58:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232726AbhDET6l (ORCPT ); Mon, 5 Apr 2021 15:58:41 -0400 Received: from mail-lj1-x233.google.com (mail-lj1-x233.google.com [IPv6:2a00:1450:4864:20::233]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E726FC061756; Mon, 5 Apr 2021 12:58:34 -0700 (PDT) Received: by mail-lj1-x233.google.com with SMTP id z8so13849067ljm.12; Mon, 05 Apr 2021 12:58:34 -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=DflEnZqNaTqhFLOszH5g6WqXbTdR2L/cK7QakrDQWfc=; b=CpvlGRHYyALnZiHrH+dTdWbIi1i+gds9+wua9epYVXW2hxl1i1v0EFQ7si+QvvGsFS aMf9p9bxxCHnVMj3CJiKtNoViqOF2xx+LGvAwL/9RDJvXBDO19n57oboqUMIbM/PUKOS YRFkeBvhSSXUXLov3k0oFlMM5zqnX01AW2ouoxNAIdxrz2Zq4A5kiqWFRbQ1C8XKuBHd uKBKMqfjLEx+aKU/PFr4cbwCWS6S/zZNEZoJbw/wyj7t1B6elPEUkfoCJ/IGI0kFeJTI 8lLk9p/I1/h7zir4J/QUVlQ5MzJoTkuMHzuYS/rld5pJStr2YIqr9ypBQEGWo30Je0Jq SLjg== 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=DflEnZqNaTqhFLOszH5g6WqXbTdR2L/cK7QakrDQWfc=; b=pVmSmh21Alb3fMRmG7djb8zebKc1HSsRHDe+rYroqVJZaLlF8n+v3BhTUbTQnFceHT wYffj6mkkLPT06DLj+YjdUilFJTbG+hpwNUd/sRnOQHeMczcxWRMFnjIxD2MaoIqA8iC IHaTt5J8YAyteYQ2a/UUK2r+sJY+0rrl1bwi5IXX03kNR/2PoopysgRD3HjrRETfrEiR ckjpT3Fhe+o1oQN1tLxxlAu62t4gc0aCoVC0Zh91LpTsFfxCZZfxlXcU9wykaezHyww4 Mk11cEZJH2fohEWTdak1l5hiH+5QVy3Yyj6q/meVkS2tNofxv64lZYj83fpV1ZEK17va e//g== X-Gm-Message-State: AOAM533enCEBhzH/ZvH34r5EYHdD/qGR3yQJY+MZk6sZ7f787DoLeEU3 7TZiAx/VimdZjkJ0dUKqUGsoNDKduxYpgLYTRk4= X-Google-Smtp-Source: ABdhPJwV9oDLdxUe9916RyWbSrL4h7ilXbHMUn8Ky0I3p2nbh1SrC6ZwUHnkd5K82l1XeUtGYdMRjA== X-Received: by 2002:a2e:8eda:: with SMTP id e26mr16527361ljl.457.1617652713303; Mon, 05 Apr 2021 12:58:33 -0700 (PDT) Received: from localhost.localdomain ([94.103.229.149]) by smtp.gmail.com with ESMTPSA id b25sm1888949lff.268.2021.04.05.12.58.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Apr 2021 12:58:32 -0700 (PDT) From: Pavel Skripkin To: alex.aring@gmail.com, stefan@datenfreihafen.org, davem@davemloft.net Cc: linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin , syzbot+7bf7b22759195c9a21e9@syzkaller.appspotmail.com Subject: [PATCH] net: fix shift-out-of-bounds in nl802154_new_interface Date: Mon, 5 Apr 2021 22:57:44 +0300 Message-Id: <20210405195744.19386-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org syzbot reported shift-out-of-bounds in nl802154_new_interface. The problem was in signed representation of enum nl802154_iftype enum nl802154_iftype { /* for backwards compatibility TODO */ NL802154_IFTYPE_UNSPEC = -1, ... Since, enum has negative value in it, objects of this type will be represented as signed integer. type = nla_get_u32(info->attrs[NL802154_ATTR_IFTYPE]); u32 will be casted to signed, which can cause negative value type. Reported-by: syzbot+7bf7b22759195c9a21e9@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin --- net/ieee802154/nl802154.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c index 7c5a1aa5adb4..6cce045e3d40 100644 --- a/net/ieee802154/nl802154.c +++ b/net/ieee802154/nl802154.c @@ -910,7 +910,7 @@ static int nl802154_new_interface(struct sk_buff *skb, struct genl_info *info) if (info->attrs[NL802154_ATTR_IFTYPE]) { type = nla_get_u32(info->attrs[NL802154_ATTR_IFTYPE]); - if (type > NL802154_IFTYPE_MAX || + if (type > NL802154_IFTYPE_MAX || type < 0 || !(rdev->wpan_phy.supported.iftypes & BIT(type))) return -EINVAL; }