gas parser: segfault in yasm_expr_get_intnum() #83
Description
Trying to build https://github.com/freebsd/freebsd/blob/master/sys/crypto/skein/amd64/skein_block_asm.s with yasm segfaults:
% ./yasm -p gas .../sys/crypto/skein/amd64/skein_block_asm.s
zsh: segmentation fault (core dumped) ./yasm -p gas
Host is FreeBSD 10.3, yasm source at 51af408
* (lldb) thread #1: tid = 102773, 0x0000000000467188 yasm`yasm_expr_get_intnum(ep=0x00007fffffffd7c8, calc_bc_dist=0) + 84 at expr.c:1377, stop reason = invalid address (fault address: 0x0)
frame #0: 0x0000000000467188 yasm`yasm_expr_get_intnum(ep=0x00007fffffffd7c8, calc_bc_dist=0) + 84 at expr.c:1377
1374 {
1375 *ep = yasm_expr_simplify(*ep, calc_bc_dist);
1376
-> 1377 if ((*ep)->op == YASM_EXPR_IDENT && (*ep)->terms[0].type == YASM_EXPR_INT)
1378 return (*ep)->terms[0].data.intn;
1379 else
1380 return (yasm_intnum *)NULL;
(lldb) bt
* thread #1: tid = 102773, 0x0000000000467188 yasm`yasm_expr_get_intnum(ep=0x00007fffffffd7c8, calc_bc_dist=0) + 84 at expr.c:1377, stop reason = invalid address (fault address: 0x0)
* frame #0: 0x0000000000467188 yasm`yasm_expr_get_intnum(ep=0x00007fffffffd7c8, calc_bc_dist=0) + 84 at expr.c:1377
frame #1: 0x000000000044042f yasm`eval_expr(pp=0x0000000801424020, arg1=0x0000000801415008) + 163 at gas-preproc.c:484
frame #2: 0x000000000044060c yasm`eval_if(pp=0x0000000801424020, negate=0, arg1=0x0000000801415008) + 108 at gas-preproc.c:541
frame #3: 0x0000000000442709 yasm`process_line(pp=0x0000000801424020, line_ptr=0x00007fffffffe038) + 825 at gas-preproc.c:1203
frame #4: 0x0000000000442db2 yasm`gas_preproc_get_line(preproc=0x0000000801424020) + 283 at gas-preproc.c:1336
frame #5: 0x000000000046ed9b yasm`preproc_input(parser_gas=0x00007fffffffe1d0, buf=0x0000000801426000, max_size=7689) + 81 at gas-token.re:64
frame #6: 0x000000000046f144 yasm`fill(parser_gas=0x00007fffffffe1d0, cursor=0x0000000801426000) + 599 at gas-token.re:123
frame #7: 0x000000000046f514 yasm`gas_parser_lex(lvalp=0x00007fffffffe330, parser_gas=0x00007fffffffe1d0) + 279 at gas-token.c:264
frame #8: 0x000000000042abba yasm`gas_parser_parse(parser_gas=0x00007fffffffe1d0) + 578 at gas-parse.c:1742
frame #9: 0x0000000000425f0b yasm`gas_parser_do_parse(object=0x0000000801420080, pp=0x0000000801424020, save_input=0, linemap=0x0000000801413040, errwarns=0x00000008014113e0) + 403 at gas-parser.c:83
frame #10: 0x0000000000402821 yasm`do_assemble + 1819 at yasm.c:521
frame #11: 0x0000000000403084 yasm`main(argc=4, argv=0x00007fffffffe540) + 1486 at yasm.c:752
frame #12: 0x0000000000401abf yasm`_start(ap=<unavailable>, cleanup=<unavailable>) + 367 at crt1.c:72