[riot-notifications] [RIOT-OS/RIOT] Missing drop implementations in netdev_driver_t::recv (#10410)

Joakim NohlgÄrd notifications at github.com
Fri Nov 16 13:55:33 CET 2018

If the kw2xdrf radio works like the kw41zrf radio, then the buffer may be overwritten whenever the first byte has been read, so there's a race condition bug waiting to happen where reading the size removes the frame buffer write protection, and a new frame is received before the actual read out of the frame buffer has been done in the second call to recv.
kw41zrf solves this by switching to standby after a completed RX, but there is also a PB_PROTECT bit which can be used to write protect the RX buffer which I did not know about until recently. I have not explored this protection bit in #7107 however.

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