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>

1 files changed, 4 insertions, 0 deletions

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

   //