Commits on Mar 10, 2023

1. dcd_nrf5x: ISO OUT handling …

   For incoming ISO OUT packets it was possible to start
   DMA from endpoint to RAM before transfer was started
   resulting in unrelated memory corruption.
   This is scenario that causes memory corruption:
   - ISO OUT packet is received
   - Packet is transferred by DMA to transfer buffer
   - xfer->started is cleared and xfer->buffer is updated as
     it is in every case
   - Application takes to long to handle it (it happens when debugger
     is connected breakpoint is hit slowing down software).
   - Next ISO OUT packet arrives
   At this point there was no check if transfer was started and packet
   was copied by DMA to location beyond previous data, possibly overwriting
   unrelated memory.
   
   This solves the issue by checking that transfer was
   started and there is buffer ready for incoming packet.

   

   kasjer committed Mar 10, 2023
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