netdev - Re: [PATCH net-next] tcp: fix null ptr deref in getsockopt(..., TCP

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Date:   Tue, 27 Jun 2017 15:39:27 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     davejwatson@...com
Cc:     ilyal@...lanox.com, aviadye@...lanox.com, borisp@...lanox.com,
        alexander.levin@...izon.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: fix null ptr deref in getsockopt(...,
 TCP_ULP, ...)

From: Dave Watson <davejwatson@...com>
Date: Mon, 26 Jun 2017 08:36:47 -0700

> If icsk_ulp_ops is unset, it dereferences a null ptr.
> Add a null ptr check.
> 
> BUG: KASAN: null-ptr-deref in copy_to_user include/linux/uaccess.h:168 [inline]
> BUG: KASAN: null-ptr-deref in do_tcp_getsockopt.isra.33+0x24f/0x1e30 net/ipv4/tcp.c:3057
> Read of size 4 at addr 0000000000000020 by task syz-executor1/15452
> 
> Signed-off-by: Dave Watson <davejwatson@...com>
> Reported-by: "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>

Applied, thanks.