linux-kernel - Re: [PATCH net-next] net: sock: fix access via invalid file descriptor

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Date:	Wed, 10 Dec 2014 23:34:42 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	fengguang.wu@...el.com, davej@...hat.com, dborkman@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: sock: fix access via invalid file
 descriptor

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Wed, 10 Dec 2014 20:14:55 -0800

> 0day robot reported the following crash:
> [   21.233581] BUG: unable to handle kernel NULL pointer dereference at 0000000000000007
> [   21.234709] IP: [<ffffffff8156ebda>] sk_attach_bpf+0x39/0xc2
> 
> It's due to bpf_prog_get() returning ERR_PTR.
> Check it properly.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Fixes: 89aa075832b0 ("net: sock: allow eBPF programs to be attached to sockets")
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
> Silly mistake. I was sure I've checked this error path. Apparently not :(

Applied, thanks Alexei.
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