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[23.128.96.18]) by mx.google.com with ESMTP id r11si10961638ill.77.2021.04.03.08.19.26; Sat, 03 Apr 2021 08:19:41 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=sEBxfjtV; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236724AbhDCPTD (ORCPT + 99 others); Sat, 3 Apr 2021 11:19:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236364AbhDCPTC (ORCPT ); Sat, 3 Apr 2021 11:19:02 -0400 Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 840CEC0613E6; Sat, 3 Apr 2021 08:18:59 -0700 (PDT) Received: by mail-lf1-x133.google.com with SMTP id d13so11359589lfg.7; Sat, 03 Apr 2021 08:18:59 -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=LJMSco07kl6UgHcL4lI5BdZNbUDIYrJUOjySLJzHFcw=; b=sEBxfjtVS3jSVCEFwhxfH7RjMIkNyDTkHmAKxhHX28Oq7cvSprBREUyQTVousYRTju MZ3hIJPWFXF/gQ/JyXlCeS+R3CIsSpIfqJtDbTJAOOVyFya08iec3zsSIv4alskyAR6J 5LJE3OnMjPvDIsmEADZUX8LI+QImh4jWx6i5qbM0hvIxkG/Xy5vDcG3cZKwgFf4s6hJj WXv5S2F8iTk1HND2alaWng6FUXjXLsWeDINEDrwK+VPHfL3KQj+VcUQmmzdj4YinjIji y/GDKxQXV1JM/Dmcsu1LKsPQqr81FxyP+CwUaihk54uwojFex0zsGbg2QkpFEGBAUZCf YDRQ== 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=LJMSco07kl6UgHcL4lI5BdZNbUDIYrJUOjySLJzHFcw=; b=nacoH6iLp5Rp1omzEgkQdELXf4ElN570jnTSSr5v7juueP3Y7Vk9cyTPIUpNXT9mmK gYNv1jFLkVQw4LmDS1TXzrVQ4vsr0enndoz021N2WN4c1jgztNFp35QiVrw1d1CCf2nO mlzxSsDmpoV+C23tf/m+9sRUOPK2aUQu7KWNFZbsX8ytiea9N1H7+L2URFhfxTvyFUxl qG6gy6Ah/gHpfGe4DBAOA5fe1wToIsDJMy1qzS/CaQeLX7gvf4AG5AFyl0Gf/VXIplLg n4dZLeNtgwj7RcavMm0dvXfYBPxenWSadGrthmFatEQLNWmGc+7Q/CBHtiL/7qoWr2Ac /4Kg== X-Gm-Message-State: AOAM531Wve45Q6eS/MW1lG9XyT2CRZSy0vec9SarwDtBRqgRsNgSeZh2 x0kDr6ZUqpWJlwVd0fT3RzA= X-Received: by 2002:a05:6512:104e:: with SMTP id c14mr11626975lfb.570.1617463137430; Sat, 03 Apr 2021 08:18:57 -0700 (PDT) Received: from localhost.localdomain ([94.103.229.149]) by smtp.gmail.com with ESMTPSA id a18sm1216549ljj.106.2021.04.03.08.18.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Apr 2021 08:18:57 -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+ac5c11d2959a8b3c4806@syzkaller.appspotmail.com Subject: [PATCH] net: fix NULL ptr dereference in nl802154_del_llsec_key Date: Sat, 3 Apr 2021 18:18:51 +0300 Message-Id: <20210403151851.9437-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot reported NULL ptr dereference in nl802154_del_llsec_key()[1] The problem was in case of info->attrs[NL802154_ATTR_SEC_KEY] == NULL. nla_parse_nested_deprecated()[2] doesn't check this condition before calling nla_len()[3] Call Trace: nla_len include/net/netlink.h:1148 [inline] [3] nla_parse_nested_deprecated include/net/netlink.h:1231 [inline] [2] nl802154_del_llsec_key+0x16d/0x320 net/ieee802154/nl802154.c:1595 [1] genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 Reported-by: syzbot+ac5c11d2959a8b3c4806@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin --- net/ieee802154/nl802154.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c index 7c5a1aa5adb4..2f0a138bd5eb 100644 --- a/net/ieee802154/nl802154.c +++ b/net/ieee802154/nl802154.c @@ -1592,7 +1592,8 @@ static int nl802154_del_llsec_key(struct sk_buff *skb, struct genl_info *info) struct nlattr *attrs[NL802154_KEY_ATTR_MAX + 1]; struct ieee802154_llsec_key_id id; - if (nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack)) + if (!info->attrs[NL802154_ATTR_SEC_KEY] || + nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack)) return -EINVAL; if (ieee802154_llsec_parse_key_id(attrs[NL802154_KEY_ATTR_ID], &id) < 0) -- 2.30.2