Segfault in Tic at lib_cur_term.c:108

[Robert Sebastian Herlim]

Hello, 

This is Robert Sebastian Herlim.

We are currently working on a new fuzz testing feature, and we found crashes in tic.

For ease of maintenance, I'll send the crash one-by-one by email.

[Step to Reproduce]
We configured ncurses with `CXXFLAGS="-g -O0" ./configure`, and run tic using

• ./tic -a -a <attached_file> -v5 -Q3

[Environment]
 - OS: Ubuntu 18.04.4 LTS
 - Compiler: gcc 7.5.0
 - ncurses version: 6.2 (https://ftp.gnu.org/pub/gnu/ncurses/ncurses-6.2.tar.gz)

[Additional Context]
I also attached the stack trace of the crash.

```
Program received signal SIGSEGV, Segmentation fault.
0x000055555556f454 in set_curterm_sp (sp=0x7fffffffa730, termp=0x7fffffffa660) at ../ncurses/./tinfo/lib_cur_term.c:108
108    PC = (char) ((pad_char != NULL) ? pad_char[0] : 0);
#0  0x000055555556f454 in set_curterm_sp (sp=0x7fffffffa730, termp=0x7fffffffa660) at ../ncurses/./tinfo/lib_cur_term.c:108
#1  0x000055555556f4ba in set_curterm (termp=0x7fffffffa660) at ../ncurses/./tinfo/lib_cur_term.c:125
#2  0x000055555557a93a in _nc_resolve_uses2 (fullresolve=true, literal=false) at ../ncurses/./tinfo/comp_parse.c:613
#3  0x0000555555560a2a in main (argc=6, argv=0x7fffffffdef8) at ../progs/tic.c:971
```

Thank you.

--

Sincerely,

Robert Sebastian Herlim

Software Testing & Verification Group, KAIST

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