[tac_plus] Strange Crash

[Daniel Schmidt]

Well, that's just weird.  Why does the latest libpam google authenticator
crash when using pap?  Works just fine for login.  Old libpam google
doesn't crash.  Not sure where the problem is.

╭─dans at cwacs ~/google-authenticator-libpam  ‹master›
╰─$ *** Error in `tac_plus': double free or corruption (!prev):
0x0000000000b3c000 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fb0082a37e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7fb0082ac37a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7fb0082b053c]
tac_plus[0x408f6a]
tac_plus[0x404234]
tac_plus[0x4129d0]
tac_plus[0x40312f]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fb00824c830]
tac_plus[0x4037a9]
======= Memory map: ========
00400000-0041b000 r-xp 00000000 fc:00 135832
/usr/local/bin/tac_plus
0061a000-0061b000 r--p 0001a000 fc:00 135832
/usr/local/bin/tac_plus
0061b000-0061c000 rw-p 0001b000 fc:00 135832
/usr/local/bin/tac_plus
0061c000-0061f000 rw-p 00000000 00:00 0
00b39000-00b5a000 rw-p 00000000 00:00 0
[heap]
(and so on)

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