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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E17F7C433EF for ; Fri, 13 May 2022 03:05:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376664AbiEMDF1 (ORCPT ); Thu, 12 May 2022 23:05:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376659AbiEMDFW (ORCPT ); Thu, 12 May 2022 23:05:22 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBDC8296BCD; Thu, 12 May 2022 20:05:10 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id l11-20020a17090a49cb00b001d923a9ca99so6587414pjm.1; Thu, 12 May 2022 20:05:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=BHwxj5/3zfJqT2Wrvjpo8DsHfoccm9nsiUOrbL558ys=; b=c0U/VBDd0f57x+RlO6UJhtq14moDx1LVcq/Xt9i5HyZxtKjX3JjQZYEmbFdwKUSo9q hhbGiXUAY7gzbWnOHD17WM0vDC3Bplaq4xwTLO4rwcy3E60mweRlYpjuBfKb91k5EivS guAG697EhWtP5JlRekHvAbQk8D7cDtzmYVh1EAi0HrSZe6LakOwvpqjO6rFU/KRhOC37 CouYvy+lJ28/OjpEzED4httUbrb2q7ZbCBbAutdnkER4Ny6B45AkFmPBCYf1BJtuYZoU ry0LMWmon8dtrWgd4zKoAztMHTaneMEDSkGadn+/WgtHirYiB9I84Swa4a89Bwe1ZVe4 p7FQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=BHwxj5/3zfJqT2Wrvjpo8DsHfoccm9nsiUOrbL558ys=; b=InMgo1xddcAwtIemPbuzkPsO+LM0mMwoGlrGICuOVWM3xSRqKiMkQvWZBLLC6YJRKw 4V21BWR5vhZcSHerDg4Jm03OPvYl5AFZhagNBoKYw0PuQtvA1n6/0pxrItJ4gI97ByYq UKUA5LXKySHs5gAi4RAEd91kXz6C2Eq16owvAv6ps1zUthMwzs78D9/vO462OmrbRYTE RtGNsICwgznEzNkzQHQkEzUtJH04Szmap4XK8ixMi10RYL4sZ63HfayCpiXkulerMATz uvLdFfaIoYMHEIqdYHWv5274uh1cxb163meU7+B4L58hUXobTinuzuuovqMzomyQzrB0 bEBQ== X-Gm-Message-State: AOAM5335VOhVVU+OIf06XX6mEWJOQPWKX9wRzjWujMinQ5SJQJ0T2u1f k5D8mX3FYVRytpZZt2o/oso= X-Google-Smtp-Source: ABdhPJwYAcMlmA0kpYY5SJtvzHRDsIyHJ7UtTXrxKOAqW1Cy9GoJNNiOfM8KsEypDaHq1ZKvCCdX2g== X-Received: by 2002:a17:902:f652:b0:156:701b:9a2a with SMTP id m18-20020a170902f65200b00156701b9a2amr2497221plg.14.1652411110315; Thu, 12 May 2022 20:05:10 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.26]) by smtp.gmail.com with ESMTPSA id b7-20020a170903228700b0015e8d4eb1f8sm638693plh.66.2022.05.12.20.05.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 May 2022 20:05:09 -0700 (PDT) From: menglong8.dong@gmail.com X-Google-Original-From: imagedong@tencent.com To: kuba@kernel.org Cc: nhorman@tuxdriver.com, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, yoshfuji@linux-ipv6.org, dsahern@kernel.org, imagedong@tencent.com, kafai@fb.com, talalahmad@google.com, keescook@chromium.org, asml.silence@gmail.com, willemb@google.com, vasily.averin@linux.dev, ilias.apalodimas@linaro.org, luiz.von.dentz@intel.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Jiang Biao , Hao Peng Subject: [PATCH net-next v3 4/4] net: tcp: reset 'drop_reason' to NOT_SPCIFIED in tcp_v{4,6}_rcv() Date: Fri, 13 May 2022 11:03:39 +0800 Message-Id: <20220513030339.336580-5-imagedong@tencent.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220513030339.336580-1-imagedong@tencent.com> References: <20220513030339.336580-1-imagedong@tencent.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Menglong Dong The 'drop_reason' that passed to kfree_skb_reason() in tcp_v4_rcv() and tcp_v6_rcv() can be SKB_NOT_DROPPED_YET(0), as it is used as the return value of tcp_inbound_md5_hash(). And it can panic the kernel with NULL pointer in net_dm_packet_report_size() if the reason is 0, as drop_reasons[0] is NULL. Fixes: 1330b6ef3313 ("skb: make drop reason booleanable") Reviewed-by: Jiang Biao Reviewed-by: Hao Peng Signed-off-by: Menglong Dong --- v3: - remove new lines between tags v2: - consider tcp_v6_rcv() --- net/ipv4/tcp_ipv4.c | 1 + net/ipv6/tcp_ipv6.c | 1 + 2 files changed, 2 insertions(+) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 918816ec5dd4..24eb42497a71 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2101,6 +2101,7 @@ int tcp_v4_rcv(struct sk_buff *skb) } discard_it: + SKB_DR_OR(drop_reason, NOT_SPECIFIED); /* Discard frame. */ kfree_skb_reason(skb, drop_reason); return 0; diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 60bdec257ba7..636ed23d9af0 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1509,6 +1509,7 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) discard: if (opt_skb) __kfree_skb(opt_skb); + SKB_DR_OR(reason, NOT_SPECIFIED); kfree_skb_reason(skb, reason); return 0; csum_err: -- 2.36.1