in ippcp rijndael functions,i meet error using free()

[bob_y_]

i use the rijndaelECB to encrypt text ,

first i malloc the memory for IppsAESSpec* rijndael_context

then i do the encryption and decryption

but when i try to free(rijndael_context)

error invalid pointer

i checked that the address for rijndael_context​ stays the same ,so whats the reason for that error 

[Chao_Y_Intel]

HI Bob,  
Can you explain how to allocate the memory,  and how to free the memory?  

regards,
Chao