From b0aa931fb84431394d995472d0af2a6c2b61064d Mon Sep 17 00:00:00 2001
From: Liu ShuoX <shuox.liu@intel.com>
Date: Mon, 17 Mar 2014 13:57:49 -0700
Subject: [PATCH] pstore: Fix NULL pointer fault if get NULL prz in
 ramoops_get_next_prz

ramoops_get_next_prz get the prz according the paramters. If it get a
uninitialized prz, access its members by following persistent_ram_old_size(prz)
will cause a NULL pointer crash.
Ex: if ftrace_size is 0, fprz will be NULL.

Fix it by return NULL in advance.

Signed-off-by: Liu ShuoX <shuox.liu@intel.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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