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https://github.com/Divested-Mobile/DivestOS-Build.git
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38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From f52d6739f6a67cf1c918a4557e88b519b9135930 Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Tue, 09 May 2017 06:29:19 -0700
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Subject: [PATCH] dccp/tcp: do not inherit mc_list from parent
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syzkaller found a way to trigger double frees from ip_mc_drop_socket()
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It turns out that leave a copy of parent mc_list at accept() time,
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which is very bad.
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Very similar to commit 8b485ce69876 ("tcp: do not inherit
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fastopen_req from parent")
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Initial report from Pray3r, completed by Andrey one.
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Thanks a lot to them !
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Change-Id: I2eac7b825a5b597af14a0573b76b685131c46726
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Reported-by: Pray3r <pray3r.z@gmail.com>
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Tested-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
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index fb10d58..325edfe 100644
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--- a/net/ipv4/inet_connection_sock.c
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+++ b/net/ipv4/inet_connection_sock.c
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@@ -618,6 +618,8 @@
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inet_sk(newsk)->inet_sport = inet_rsk(req)->loc_port;
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newsk->sk_write_space = sk_stream_write_space;
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+ inet_sk(newsk)->mc_list = NULL;
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+
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newsk->sk_mark = inet_rsk(req)->ir_mark;
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newicsk->icsk_retransmits = 0;
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