Segfault because of NULL in "tmpl"

[husak]

Honeyd received segfault while dealing with udp packets because "tmpl" was not checked for NULL in udp_recv_cb

Program received signal SIGSEGV, Segmentation fault.
udp_recv_cb (tmpl=0x0, pkt=pkt@entry=0x7ffff5cbb6a4 "E", pktlen=pktlen@entry=58) at honeyd.c:2719
2719            if (!strcmp("default", tmpl->name))  {
(gdb) backtrace
#0  udp_recv_cb (tmpl=0x0, pkt=pkt@entry=0x7ffff5cbb6a4 "E", pktlen=pktlen@entry=58) at honeyd.c:2719
#1  0x0000000000413deb in honeyd_dispatch (tmpl=tmpl@entry=0x0, iface=<optimized out>, ip=ip@entry=0x7ffff5cbb6a4, iplen=iplen@entry=58) at honeyd.c:3029
#2  0x0000000000414262 in honeyd_delay_cb (fd=<optimized out>, which=<optimized out>, arg=0x7fffffffd5c0) at honeyd.c:876
#3  0x000000000040f09b in honeyd_delay_packet (tmpl=tmpl@entry=0x0, iface=iface@entry=0x102ae50, ip=0x7ffff5cbb6a4, iplen=58, src=src@entry=0x0, dst=dst@entry=0x0, ms=0, flags=<optimized out>, spoof=...)
    at honeyd.c:944
#4  0x00000000004147ea in honeyd_input (inter=inter@entry=0x102ae50, ip=ip@entry=0x7ffff5cbb6a4, iplen=<optimized out>, iplen@entry=58) at honeyd.c:3343
#5  0x000000000041499d in honeyd_recv_cb (ag=0x102ae50 "", pkthdr=<optimized out>, pkt=0x7ffff5cbb696 "") at honeyd.c:3417
#6  0x00007ffff7fbdfbe in ?? () from /usr/lib/x86_64-linux-gnu/libpcap.so.0.8
#7  0x000000000042c26a in interface_recv (fd=<optimized out>, type=<optimized out>, arg=0x102ae50) at interface.c:556
#8  0x00007ffff7ba6ccc in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
#9  0x000000000040d90b in main (argc=<optimized out>, argv=<optimized out>) at honeyd.c:3950

[altf4]

Thanks for the bug report! Could you by chance tell us just a few extra things:

a) What exact build are you using? Perhaps post the git hash. b) What were you doing at the time the segfault occurred?

[PherricOxide]

Could you also provide your honeyd configuration file located at,

 ~/.config/nova/config/haystack_honeyd.config