From: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Date: Fri, 6 Jul 2012 01:30:58 +0000 (+0000)
Subject: powerpc/hw_breakpoints: Fix incorrect pointer access
X-Git-Tag: v3.6-rc1~132^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac84aa2b3b9b791eac45174d1966d5fdf3bbba1c;p=pandora-kernel.git

powerpc/hw_breakpoints: Fix incorrect pointer access

If arch_validate_hwbkpt_settings() fails, bp->ctx won't be valid and the
kernel panics. Add a check to fix this.

Reported-by: Edjunior Barbosa Machado <emachado@linux.vnet.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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