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| author |   Eric Dumazet <edumazet@google.com> | 2017-05-09 06:29:19 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-05-09 15:17:49 -0400 |
| commit | 657831ffc38e30092a2d5f03d385d710eb88b09a (patch) | |
| tree | d1d51e11210d51989a2e18caf12efcb7008b1396 /net/ipv4/inet_connection_sock.c | |
| parent | Merge branch 'qed-general-fixes' (diff) | |
| download | linux-dev-657831ffc38e30092a2d5f03d385d710eb88b09a.tar.xz linux-dev-657831ffc38e30092a2d5f03d385d710eb88b09a.zip | |
dccp/tcp: do not inherit mc_list from parent
syzkaller found a way to trigger double frees from ip_mc_drop_socket()
It turns out that leave a copy of parent mc_list at accept() time,
which is very bad.
Very similar to commit 8b485ce69876 ("tcp: do not inherit
fastopen_req from parent")
Initial report from Pray3r, completed by Andrey one.
Thanks a lot to them !
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Pray3r <pray3r.z@gmail.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_connection_sock.c')
| -rw-r--r-- | net/ipv4/inet_connection_sock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 5e313c1ac94f..1054d330bf9d 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -794,6 +794,8 @@ struct sock *inet_csk_clone_lock(const struct sock *sk, /* listeners have SOCK_RCU_FREE, not the children */ sock_reset_flag(newsk, SOCK_RCU_FREE); + inet_sk(newsk)->mc_list = NULL; + newsk->sk_mark = inet_rsk(req)->ir_mark; atomic64_set(&newsk->sk_cookie, atomic64_read(&inet_rsk(req)->ir_cookie)); |