[bsp]Fixed a  stack overflow bug in drv_crypto.c
Added if null before used.
@@ -168,6 +168,11 @@ static rt_err_t _crypto_create(struct rt_hwcrypto_ctx *ctx)
case HWCRYPTO_TYPE_RNG:
{
RNG_HandleTypeDef *hrng = rt_calloc(1, sizeof(RNG_HandleTypeDef));
+ if (RT_NULL == hrng)
+ {
+ res = -RT_ERROR;
+ break;
+ }
hrng->Instance = RNG;
HAL_RNG_Init(hrng);
