The bug is in isc-dhcp, file common/discover.c, function next_iface4():
char buf[256];
This buffer is exceeded when the function performs an fgets() from
/proc/net/dev and an interface has a very high (PB or greater) number of
bytes, collisions, etc. as per this ifconfig output:
eth0 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:1006693089307755 errors:6040167125781120
dropped:2013394768550100 overruns:1006697384275050 frame:5033478331440660
TX packets:1006697384275050 errors:4026789537100200 dropped:0
overruns:1006697384275050 carrier:2013394768550100
collisions:5033486921375250 txqueuelen:1000
RX bytes:1006693089307755 (1.0 PB) TX bytes:1006697384275050 (1.0 PB)
I have raised this with ISC and hopefully they will fix it. If you want
to patch it anyway, simply double the buffer size.
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https://bugs.launchpad.net/bugs/1222377
Title:
network-manager stops connecting to Wi-Fi after 1 PB transferred on
any interface
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