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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 FreePool() interface of the MemoryAllocationLib class: Buffer must have been allocated on a previous call to the pool allocation services of the Memory Allocation Library. [...] If Buffer was not allocated with a pool allocation function in the Memory Allocation Library, then ASSERT(). Therefore we must not forward the argument of free() to FreePool() without checking. Cc: Cecil Sheng <cecil.sheng@hpe.com> Cc: Cinnamon Shia <cinnamon.shia@hpe.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Qiu Shumin <shumin.qiu@intel.com> Cc: Samer El-Haj-Mahmoud <elhaj@hpe.com> Cc: Yao Jiewen <Jiewen.Yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-By: Cinnamon Shia <cinnamon.shia@hpe.com>