RTOS SDK / ESPCONN: allocating in RX callback?

[esp03madness]

I am trying to decide how to ferry data that arrives in the "espconn network receive callback" to a processing thread. The callback has the following prototype:

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static void
network_resoved_cb (void* arg, char* data, usigned short len)

I assume (please correct me if this is wrong) that "data" will be freed when the callback returns. Therefore, I need to move "data" to a safe place where it can wait for delayed processing.

I am thinking of doing something like this:

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receive_callback(data, len):
  //using heap_4.c
  saved_data = pvPortMalloc(len)
  copy data -> saved_data
  xQueueSendToBack(saved_data)
 
processing_thread:
  saved_data = xQueueReceive()
  //do something with saved_data
  vPortFree(saved_data)

Is this a bad idea? Use of heap_4.c is supposed to limit heap fragmentation, but I thought it would be better to ask first.