[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_nib: release when not queuable on AR (#10860)

Martine Lenders notifications at github.com
Fri Jan 25 00:10:11 CET 2019



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### Contribution description
As mentioned in https://github.com/RIOT-OS/RIOT/pull/10859#issuecomment-457228518 I was still able to cause leaks in the packet buffer. This was because when a new queue entry is tried to be allocated for a neighbor who's address is currently tried to be resolved there was no error case before. The packet that was tried to be  put in the queue was thus not released and stayed in the packet buffer for ever.
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### Testing procedure
I started a native instance with `gnrc_pktbuf_cmd` compiled in. I then used `scapy` to spam the node with ICMPv6 echo requests with non-existent source addresses:

```py
sendp(Ether(dst="<native l2addr>") / IPv6(src="fe80::1", dst="<native lladdr>") / ICMPv6EchoRequest(), iface="tapbr0", count=100)
```

Without this PR the *replies* stick in the packet buffer. With it the packet buffer stays empty.
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### Issues/PRs references
See https://github.com/RIOT-OS/RIOT/pull/10859#issuecomment-457228518
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/10860

-- Commit Summary --

  * gnrc_ipv6_nib: release when not queuable on AR

-- File Changes --

    M sys/net/gnrc/network_layer/ipv6/nib/nib.c (5)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/10860.patch
https://github.com/RIOT-OS/RIOT/pull/10860.diff

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