linux-kernel - [PATCH 0/1] ipv6: fix restrict IPV6

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Date:   Sat, 18 Apr 2020 16:30:48 +0100
From:   John Haxby <john.haxby@...cle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     John Haxby <john.haxby@...cle.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] ipv6: fix restrict IPV6_ADDRFORM operation

Commit b6f6118901d1 ("ipv6: restrict IPV6_ADDRFORM operation") added a
check to ensure that sk->sk_prot is the default pointer for a TCP IPv6
socket, an issue found by syzbot.

The earlier code simply had

    if (sk->sk_protocol != IPPROTO_TCP)
       break;

and the new code degenerated to

    if (sk->sk_protocol == IPPROTO_TCP)
       break;

the very opposite of what was intended.  The following patch
rearranges the checks so that the original sk->sk_prot == &tcpv6_prot
is just one of the series of checks made before moving the socket.

jch

John Haxby (1):
  ipv6: fix restrict IPV6_ADDRFORM operation

 net/ipv6/ipv6_sockglue.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

-- 
2.25.3