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

[David Miller]

From: Alexei Starovoitov <ast@xxxxxxxxxxxx>
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@xxxxxxxxx>
> Fixes: 89aa075832b0 ("net: sock: allow eBPF programs to be attached to sockets")
> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxxxx>
> ---
> Silly mistake. I was sure I've checked this error path. Apparently not :(

Applied, thanks Alexei.
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