patch 8.1.0098: segfault when pattern with \z() is very slow
Problem: Segfault when pattern with \z() is very slow.
Solution: Check for NULL regprog. Add "nfa_fail" to test_override() to be
able to test this. Fix that 'searchhl' resets called_emsg.
diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index 0ead03a..e629699 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -1482,7 +1482,7 @@
case '8':
case '9':
/* \z1...\z9 */
- if (reg_do_extmatch != REX_USE)
+ if ((reg_do_extmatch & REX_USE) == 0)
EMSG_RET_FAIL(_(e_z1_not_allowed));
EMIT(NFA_ZREF1 + (no_Magic(c) - '1'));
/* No need to set nfa_has_backref, the sub-matches don't
@@ -1491,7 +1491,7 @@
break;
case '(':
/* \z( */
- if (reg_do_extmatch != REX_SET)
+ if ((reg_do_extmatch & REX_SET) == 0)
EMSG_RET_FAIL(_(e_z_not_allowed));
if (nfa_reg(REG_ZPAREN) == FAIL)
return FAIL; /* cascaded error */
@@ -5692,7 +5692,8 @@
nextlist->n = 0; /* clear nextlist */
nextlist->has_pim = FALSE;
++nfa_listid;
- if (prog->re_engine == AUTOMATIC_ENGINE && nfa_listid >= NFA_MAX_STATES)
+ if (prog->re_engine == AUTOMATIC_ENGINE
+ && (nfa_listid >= NFA_MAX_STATES || nfa_fail_for_testing))
{
/* too many states, retry with old engine */
nfa_match = NFA_TOO_EXPENSIVE;