#57 Segmentation Fault in make_arrow() function

[Suhwan Song]

Hi,
I found Segmentation fault in make_arrow at arrow.c:89
Please run following command to reproduce it,

fig2dev -L ptk $PoC

Here's log

ASAN:DEADLYSIGNAL
=================================================================
==9865==ERROR: AddressSanitizer: SEGV on unknown address 0x562ace7fe851 (pc 0x562b31599ec0 bp 0x7fff6b64fd10 sp 0x7fff6b64fce0 T0)
==9865==The signal is caused by a WRITE memory access.
    #0 0x562b31599ebf in make_arrow fig2dev-3.2.7b/fig2dev/arrow.c:89
    #1 0x562b315b4125 in read_arcobject fig2dev-3.2.7b/fig2dev/read.c:594
    #2 0x562b315b242c in read_objects fig2dev-3.2.7b/fig2dev/read.c:422
    #3 0x562b315b11d3 in readfp_fig fig2dev-3.2.7b/fig2dev/read.c:172
    #4 0x562b315b10a9 in read_fig fig2dev-3.2.7b/fig2dev/read.c:142
    #5 0x562b315a8ef3 in main fig2dev-3.2.7b/fig2dev/fig2dev.c:422
    #6 0x7fa7dfbb6b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #7 0x562b31599979 in _start (fig2dev+0x6e979)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV fig2dev-3.2.7b/fig2dev/arrow.c:89 in make_arrow
==9865==ABORTING

fig2dev Version 3.2.7b

[tkl]

Commit [3065ab] should fix this issue.