From: Markos Chandras <markos.chandras@imgtec.com>
Date: Wed, 25 Jun 2014 08:37:21 +0000 (+0100)
Subject: MIPS: BPF: Prevent kernel fall over for >=32bit shifts
X-Git-Tag: omap-for-v3.16/fixes-rc4~42^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95782bf434437b3292f5cb9ce21b53bdbc1beda1;p=pandora-kernel.git

MIPS: BPF: Prevent kernel fall over for >=32bit shifts

Remove BUG_ON() if the shift immediate is >=32 to avoid kernel crashes
due to malicious user input. If the shift immediate is >= 32,
we simply load the destination register with 0 since only
32-bit instructions are used by JIT so this will do the
correct thing even on MIPS64.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Daniel Borkmann <dborkman@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: netdev@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7179/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

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