43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
From 1853870b216d3446efd39190a8ff0006c54dfd46 Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Tue, 9 May 2017 06:29:19 -0700
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Subject: [PATCH] BACKPORT: 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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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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Signed-off-by: Roberto Pereira <rpere@google.com>
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(cherry picked from commit 657831ffc38e30092a2d5f03d385d710eb88b09a)
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Bug:38413975
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Change-Id: Icf89ad025cb8225e806e52c573d68533912111ad
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---
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net/ipv4/inet_connection_sock.c | 2 ++
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1 file changed, 2 insertions(+)
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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 64198a381ddca..008b52bc99a3d 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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@@ -697,6 +697,8 @@ struct sock *inet_csk_clone_lock(const struct sock *sk,
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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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