Hello list,

I'm experiencing crashes in wg_allowedips_insert_v4 and 
wg_allowedips_insert_v6 in the wireguard kernel module. It happens both 
with the current snapshot (0.0.20190227-wg1~bionic) and the current git 
master (65e1f283). It seems to be caused by commit 20a230b3 (allowedips: 
maintain per-peer list of allowedips), since I can't trigger the bug(s) 
after reverting that commit.

I have attached a dmesg dump of one general protection fault, and 
included two scripts below which triggers the bug(s). I am running 
Ubuntu 18.04 x86_64 with mainline linux 5.0.5 from 
https://kernel.ubuntu.com/~kernel-ppa/mainline.

/Mikma

#!/bin/sh

name=wgtest
key="pUZ1gXtFRRNeJFcBx2cGLELdeJTA00nTdQMuHjMYI2E="

ips="
0.0.0.0/0
10.0.0.0/8
100.64.0.0/10
172.16.0.0/12
192.168.0.0/16
"

allowed_ips=$(echo $ips | tr ' ' ',')

ip l add $name type wireguard
wg set $name peer $key allowed-ips $allowed_ips
wg set $name peer $key allowed-ips '0.0.0.0/0'


#!/bin/sh

name=wgtest
key="pUZ1gXtFRRNeJFcBx2cGLELdeJTA00nTdQMuHjMYI2E="

ips="
::/0
17e5:9cdb:34ce:1800::/111
5000::/4
eb3f:fbec:5000::/37
9730:9636:d403:e000::/75
"

allowed_ips=$(echo $ips | tr ' ' ',')

ip l add $name type wireguard
wg set $name peer $key allowed-ips $allowed_ips
wg set $name peer $key allowed-ips '::/0'