From 34791faedd6449762fb9110151f70c7ef3713fd0 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Wed, 24 Feb 2016 21:00:04 +0100
Subject: CryptoPkg: RuntimeCryptLib: support realloc(NULL, size)

The ISO C standard says about realloc(),

  If ptr is a null pointer, the realloc function behaves like the malloc
  function for the specified size.

The realloc() implementation doesn't conform to this currently, so add a
check and call malloc() if appropriate.

Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Qin Long <qin.long@intel.com>
Cc: Ting Ye <ting.ye@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Qin Long <qin.long@intel.com>
(cherry picked from commit e89d672110aaf1c5a85404375ca6767b099d3b50)
---
 CryptoPkg/Library/BaseCryptLib/SysCall/RuntimeMemAllocation.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/RuntimeMemAllocation.c b/CryptoPkg/Library/BaseCryptLib/SysCall/RuntimeMemAllocation.c
index 45ef9ff5f2..413e47e923 100644
--- a/CryptoPkg/Library/BaseCryptLib/SysCall/RuntimeMemAllocation.c
+++ b/CryptoPkg/Library/BaseCryptLib/SysCall/RuntimeMemAllocation.c
@@ -396,6 +396,10 @@ void *realloc (void *ptr, size_t size)
   UINTN  StartPageIndex;
   UINTN  PageCount;
 
+  if (ptr == NULL) {
+    return malloc (size);
+  }
+
   //
   // Get Original Size of ptr
   //
-- 
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