netdev - [PATCH net] ipv6: dccp: add missing bind_conflict to dccp_ipv6

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Date:   Thu, 03 Nov 2016 08:59:46 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        netdev <netdev@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        Gerrit Renker <gerrit@....abdn.ac.uk>, dccp@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH net] ipv6: dccp: add missing bind_conflict to
 dccp_ipv6_mapped

From: Eric Dumazet <edumazet@...gle.com>

While fuzzing kernel with syzkaller, Andrey reported a nasty crash
in inet6_bind() caused by DCCP lacking a required method.

Fixes: ab1e0a13d7029 ("[SOCK] proto: Add hashinfo member to struct proto")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
Tested-by: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 net/dccp/ipv6.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 3828f94b234c..95353bdbfa7b 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -956,6 +956,7 @@ static const struct inet_connection_sock_af_ops
dccp_ipv6_mapped = {
 	.getsockopt	   = ipv6_getsockopt,
 	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
 	.sockaddr_len	   = sizeof(struct sockaddr_in6),
+	.bind_conflict	   = inet6_csk_bind_conflict,
 #ifdef CONFIG_COMPAT
 	.compat_setsockopt = compat_ipv6_setsockopt,
 	.compat_getsockopt = compat_ipv6_getsockopt,