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CryptoPkg: RuntimeCryptLib: support free(NULL)

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The ISO C standard says about free(),

  If ptr is a null pointer, no action occurs.

This is not true of the RuntimeFreeMem() internal function. Therefore we
must not forward the argument of free() to RuntimeFreeMem() without
checking.

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>
This commit is contained in:
Laszlo Ersek 2016-02-24 21:00:04 +01:00
parent 211372d63a
commit 1246dde58e
1 changed files with 7 additions and 1 deletions
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8
CryptoPkg/Library/BaseCryptLib/SysCall/RuntimeMemAllocation.c
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@ -434,5 +434,11 @@ void *realloc (void *ptr, size_t size)
/* Deallocates or frees a memory block */ /* Deallocates or frees a memory block */
void free (void *ptr) void free (void *ptr)
{ {
RuntimeFreeMem (ptr); //
// In Standard C, free() handles a null pointer argument transparently. This
// is not true of RuntimeFreeMem() below, so protect it.
//
if (ptr != NULL) {
RuntimeFreeMem (ptr);
}
} }