From: Alexei Starovoitov <ast@plumgrid.com>
Date: Thu, 11 Dec 2014 04:14:55 +0000 (-0800)
Subject: net: sock: fix access via invalid file descriptor
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~122^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=198bf1b046e370a7d3987b195cff5f1efebec3ac;p=pandora-kernel.git

net: sock: fix access via invalid file descriptor

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@intel.com>
Fixes: 89aa075832b0 ("net: sock: allow eBPF programs to be attached to sockets")
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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