linux-kernel - [PATCH 3.2 076/126] ipv6: dccp: add missing bind_conflict to dccp_ipv6

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Message-ID: <lsq.1487198494.336007482@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Arnaldo Carvalho de Melo" <acme@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        "Andrey Konovalov" <andreyknvl@...gle.com>
Subject: [PATCH 3.2 076/126] ipv6: dccp: add missing bind_conflict to
 dccp_ipv6_mapped

3.2.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 990ff4d84408fc55942ca6644f67e361737b3d8e upstream.

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>
Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/dccp/ipv6.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -1037,6 +1037,7 @@ static const struct inet_connection_sock
 	.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,