Nmap stops with error: "buffer 0verfl0w of familygenerations" on large scans

[Jan Kaestle <jan.kaestle () googlemail com>]

Hi,

nmap stops on large scans with the error "buffer 0verfl0w of
familygenerations QUITTING!". Nmap just prints out this message and
stops. I got this error several times after scanning a few thousands
up to at most 40.000 hosts with OS and version detection enabled.

This is the command I used:

nmap -v -T4 -sS -Pn --top-ports 100 -n -sV --host-timeout 10m -O -oA
nmap_tcp_top100_1 -iL active_ips_all_1.txt

The error is printed in line 1541 in output.cc:
if (flen + 2 + strlen(OSR->OSC[classno]->OS_Generation) >=
    sizeof(familygenerations[familyno]))
  fatal("buffer 0verfl0w of familygenerations");

The error both occured on Debian 6.0.6 and Ubuntu 12.04

I am using Nmap 6.01.

For me I could fix this bug by doubling the array that is allocated in
line 1489 of output.cc

char familygenerations[MAX_OS_CLASSMEMBERS][96];


Jan
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