[core] fix reqpool mem corruption in 1.4.62 (fixes #3118)

x-ref:
  "Segfault after updating to version 1.4.62"
  https://redmine.lighttpd.net/issues/3118
  "Segfault on closing connections"
  https://redmine.lighttpd.net/issues/3119

src/configfile-glue.c

@@ -692,7 +692,7 @@ static int config_pcre_match(request_st * const r, const data_config * const dc,
       r->cond_match[capture_offset] = r->cond_match_data + capture_offset;
     if (__builtin_expect( (NULL == cond_match->matches), 0)) {
         /*(allocate on demand)*/
-        cond_match->matches = malloc(dc->ovec_nelts * sizeof(int *));
+        cond_match->matches = malloc(dc->ovec_nelts * sizeof(int));
         force_assert(cond_match->matches);
     }
     cond_match->comp_value = b; /*holds pointer to b (!) for pattern subst*/

src/h2.c

@@ -2573,7 +2573,7 @@ h2_init_stream (request_st * const h2r, connection * const con)
   #ifdef HAVE_PCRE
     if (srv->config_captures)
         memcpy(r->cond_match, h2r->cond_match,
-               srv->config_captures * sizeof(cond_match_t));
+               srv->config_captures * sizeof(cond_match_t *));
   #endif
     /*(see request_config_reset() and request_reset_ex())*/
     r->server_name = h2r->server_name;

src/reqpool.c

@@ -66,7 +66,8 @@ request_init_data (request_st * const r, connection * const con, server * const
     force_assert(NULL != r->cond_cache);
 
   #ifdef HAVE_PCRE
-    if (srv->config_captures) {/*(save 128b per con if no regex conditions)*/
+    if (srv->config_captures) {
+        r->cond_captures = srv->config_captures;
         r->cond_match = calloc(srv->config_captures, sizeof(cond_match_t *));
         force_assert(NULL != r->cond_match);
         r->cond_match_data = calloc(srv->config_captures, sizeof(cond_match_t));
@@ -232,7 +233,7 @@ request_free_data (request_st * const r)
     free(r->cond_cache);
   #ifdef HAVE_PCRE
     if (r->cond_match_data) {
-        for (int i = 0, used = r->con->srv->config_captures; i < used; ++i) {
+        for (int i = 0, used = r->cond_captures; i < used; ++i) {
           #ifdef HAVE_PCRE2_H
             if (r->cond_match_data[i].match_data)
                 pcre2_match_data_free(r->cond_match_data[i].match_data);

src/request.h

@@ -194,6 +194,7 @@ struct request_st {
     struct chunkqueue reqbody_queue; /*(might use tempfiles)*/
 
     struct stat_cache_entry *tmp_sce; /*(value valid only in sequential code)*/
+    int cond_captures;
 };