https://issues.redhat.com/browse/RHEL-36755

--- httpd-2.4.59/modules/ssl/ssl_engine_init.c.24	2024-05-22 08:13:42.478057351 +0100
+++ httpd-2.4.59/modules/ssl/ssl_engine_init.c	2024-05-22 08:13:42.489057431 +0100
@@ -1460,7 +1460,7 @@
         if (modssl_is_engine_id(keyfile)) {
             apr_status_t rv;
 
-            if ((rv = modssl_load_engine_keypair(s, ptemp, vhost_id,
+            if ((rv = modssl_load_engine_keypair(s, p, ptemp, vhost_id,
                                                  engine_certfile, keyfile,
                                                  &cert, &pkey))) {
                 return rv;
--- httpd-2.4.59/modules/ssl/ssl_engine_pphrase.c.24	2024-05-22 08:13:42.443057094 +0100
+++ httpd-2.4.59/modules/ssl/ssl_engine_pphrase.c	2024-05-22 08:18:55.179844757 +0100
@@ -830,8 +830,19 @@
 #endif
 
 #if MODSSL_HAVE_ENGINE_API
-static apr_status_t modssl_load_keypair_engine(server_rec *s, apr_pool_t *p,
-                                        const char *vhostid,
+
+static apr_status_t modssl_engine_cleanup(void *engine)
+{
+    ENGINE *e = engine;
+
+    ENGINE_finish(e);
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t modssl_load_keypair_engine(server_rec *s,
+                                               apr_pool_t *pconf, apr_pool_t *ptemp,
+                                               const char *vhostid,
                                                const char *certid,
                                                const char *keyid,
                                                X509 **pubkey,
@@ -839,12 +850,12 @@
 {
     const char *c, *scheme;
     ENGINE *e;
-    UI_METHOD *ui_method = get_passphrase_ui(p);
+    UI_METHOD *ui_method = get_passphrase_ui(ptemp);
     pphrase_cb_arg_t ppcb;
 
     memset(&ppcb, 0, sizeof ppcb);
     ppcb.s = s;
-    ppcb.p = p;
+    ppcb.p = ptemp;
     ppcb.bPassPhraseDialogOnce = TRUE;
     ppcb.key_id = vhostid;
     ppcb.pkey_file = keyid;
@@ -857,7 +868,7 @@
         return ssl_die(s);
     }
 
-    scheme = apr_pstrmemdup(p, keyid, c - keyid);
+    scheme = apr_pstrmemdup(ptemp, keyid, c - keyid);
     if (!(e = ENGINE_by_id(scheme))) {
         ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10132)
                      "Init: Failed to load engine for private key %s",
@@ -906,7 +917,8 @@
         return ssl_die(s);
     }
 
-    ENGINE_finish(e);
+    apr_pool_cleanup_register(pconf, e, modssl_engine_cleanup, modssl_engine_cleanup);
+
     ENGINE_free(e);
 
     return APR_SUCCESS;
@@ -1007,7 +1019,8 @@
 }
 #endif
 
-apr_status_t modssl_load_engine_keypair(server_rec *s, apr_pool_t *p,
+apr_status_t modssl_load_engine_keypair(server_rec *s,
+                                        apr_pool_t *pconf, apr_pool_t *ptemp,
                                         const char *vhostid,
                                         const char *certid, const char *keyid,
                                         X509 **pubkey, EVP_PKEY **privkey)
@@ -1016,11 +1029,11 @@
     SSLModConfigRec *mc = myModConfig(s);
 
     if (!mc->szCryptoDevice)
-        return modssl_load_keypair_store(s, p, vhostid, certid, keyid,
+        return modssl_load_keypair_store(s, ptemp, vhostid, certid, keyid,
                                          pubkey, privkey);
 #endif
 #if MODSSL_HAVE_ENGINE_API
-    return modssl_load_keypair_engine(s, p, vhostid, certid, keyid,
+    return modssl_load_keypair_engine(s, pconf, ptemp, vhostid, certid, keyid,
                                       pubkey, privkey);
 #else
     return APR_ENOTIMPL;
diff -uap httpd-2.4.59/modules/ssl/ssl_private.h.24 httpd-2.4.59/modules/ssl/ssl_private.h
--- httpd-2.4.59/modules/ssl/ssl_private.h.24	2024-05-22 08:13:42.479057358 +0100
+++ httpd-2.4.59/modules/ssl/ssl_private.h	2024-05-22 08:13:42.489057431 +0100
@@ -1090,7 +1090,8 @@
 /* Load public and/or private key from the configured ENGINE. Private
  * key returned as *pkey.  certid can be NULL, in which case *pubkey
  * is not altered.  Errors logged on failure. */
-apr_status_t modssl_load_engine_keypair(server_rec *s, apr_pool_t *p,
+apr_status_t modssl_load_engine_keypair(server_rec *s,
+                                        apr_pool_t *pconf, apr_pool_t *ptemp,
                                         const char *vhostid,
                                         const char *certid, const char *keyid,
                                         X509 **pubkey, EVP_PKEY **privkey);