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Refuse patterns that match the empty string

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This commit is contained in:
dmiller 2026-05-26 18:56:45 +00:00
parent 3cb27110dc
commit 713f8091ba
1 changed files with 6 additions and 0 deletions
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6
service_scan.cc
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@ -435,6 +435,12 @@ void ServiceProbeMatch::InitMatch(const char *matchtext, int lineno) {
if (regex_compiled == NULL)
fatal("%s: illegal regexp on line %d of nmap-service-probes (at regexp offset %ld): %d\n", __func__, lineno, pcre2_erroffset, pcre2_errcode);
uint32_t value = 0;
pcre2_errcode = pcre2_pattern_info(regex_compiled, PCRE2_INFO_MATCHEMPTY, &value);
if (pcre2_errcode == 0 && value != 0)
fatal("%s: parse error on line %d of nmap-service-probes: pattern matches zero-length string", __func__, lineno);
// creates a new match data block for holding the result of a match
match_data = pcre2_match_data_create_from_pattern(
regex_compiled,NULL