[Mixmaster-devel] segfault on chains greater than 21 remailers

[Len S. <ra...@qu...>]

Okay, this bug is driving me nuts and has been doing so for over a month.
Rodney Thayer and I spent an afternoon trying to find the source of this
thing, and it escaped us. (It's apparently an array of 20 being set before
the chain length checking kicks in, but I can't seem to find it.)

See line 88 of chain.c for the (apparently broken) chain length test.

backtrace output:

(gdb) set args -d -l *,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*
(gdb) run
Starting program: /usr/home/rabbi/Mix/mix -d -l
*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*
Mixmaster 2.9beta32 - Copyright Anonymizer Inc.

Program received signal SIGSEGV, Segmentation fault.
0x806eb56 in buf_clear (buffer=0x0) at buffers.c:96
96        buffer->data[0] = '\0';
(gdb) bt
#0  0x806eb56 in buf_clear (buffer=0x0) at buffers.c:96
#1  0x80555a9 in mix2_encrypt (type=0, message=0x0,
    chainstr=0xbffff458 "*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*",
    numcopies=1, feedback=0x80b1418) at chain2.c:378
#2  0x805100c in mix_encrypt (type=0, message=0x0,
    chainstr=0xbffff458 "*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*,*",
    numcopies=0, chainlist=0x80b1418) at chain.c:180
#3  0x807ac0e in main (argc=4, argv=0xbffff8f4) at main.c:544
(gdb)