netdev - Re: [PATCH net] sctp: handle two v4 addrs comparison in sctp_inet6_cmp

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Date:   Fri, 27 Apr 2018 13:22:36 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] sctp: handle two v4 addrs comparison in
 sctp_inet6_cmp_addr

From: Xin Long <lucien.xin@...il.com>
Date: Thu, 26 Apr 2018 14:13:57 +0800

> Since sctp ipv6 socket also supports v4 addrs, it's possible to
> compare two v4 addrs in pf v6 .cmp_addr, sctp_inet6_cmp_addr.
> 
> However after Commit 1071ec9d453a ("sctp: do not check port in
> sctp_inet6_cmp_addr"), it no longer calls af1->cmp_addr, which
> in this case is sctp_v4_cmp_addr, but calls __sctp_v6_cmp_addr
> where it handles them as two v6 addrs. It would cause a out of
> bounds crash.
> 
> syzbot found this crash when trying to bind two v4 addrs to a
> v6 socket.
> 
> This patch fixes it by adding the process for two v4 addrs in
> sctp_inet6_cmp_addr.
> 
> Fixes: 1071ec9d453a ("sctp: do not check port in sctp_inet6_cmp_addr")
> Reported-by: syzbot+cd494c1dd681d4d93ebb@...kaller.appspotmail.com
> Signed-off-by: Xin Long <lucien.xin@...il.com>

What a long chain we are building of fixes to fixes to fixes... :(

Applied and queued up for -stable, thanks.