More edge case fixes that may cause bug #78106

Author: dstogov

ext/opcache/ZendAccelerator.c

@@ -439,7 +439,7 @@ static zend_always_inline zend_string *accel_find_interned_string(zend_string *s
 
 	if (!ZCG(counted)) {
 		if (!ZCG(accelerator_enabled) || accel_activate_add() == FAILURE) {
-			return str;
+			return NULL;
 		}
 		ZCG(counted) = 1;
 	}
@@ -747,10 +747,9 @@ static void accel_use_shm_interned_strings(void)
 	if (ZCSG(interned_strings).saved_top == NULL) {
 		accel_copy_permanent_strings(accel_new_interned_string);
 	} else {
+		ZCG(counted) = 1;
 		accel_copy_permanent_strings(accel_replace_string_by_shm_permanent);
-		if (ZCG(counted)) {
-			accel_deactivate_sub();
-		}
+		ZCG(counted) = 0;
 	}
 	accel_interned_strings_save_state();
 
@@ -1177,7 +1176,11 @@ char *accel_make_persistent_key(const char *path, size_t path_length, int *key_l
 						cwd_len = ZCG(cwd_key_len) = buf + sizeof(buf) - 1 - res;
 						cwd = ZCG(cwd_key);
 						memcpy(ZCG(cwd_key), res, cwd_len + 1);
+					} else {
+						return NULL;
 					}
+				} else {
+					return NULL;
 				}
 			}
 		}
@@ -1216,7 +1219,11 @@ char *accel_make_persistent_key(const char *path, size_t path_length, int *key_l
 						include_path_len = ZCG(include_path_key_len) = buf + sizeof(buf) - 1 - res;
 						include_path = ZCG(include_path_key);
 						memcpy(ZCG(include_path_key), res, include_path_len + 1);
+					} else {
+						return NULL;
 					}
+				} else {
+					return NULL;
 				}
 			}
 		}
@@ -2290,6 +2297,7 @@ static void accel_reset_pcre_cache(void)
 int accel_activate(INIT_FUNC_ARGS)
 {
 	if (!ZCG(enabled) || !accel_startup_ok) {
+		ZCG(accelerator_enabled) = 0;
 		return SUCCESS;
 	}
 
@@ -2306,6 +2314,7 @@ int accel_activate(INIT_FUNC_ARGS)
 	ZCG(cwd_check) = 1;
 
 	if (file_cache_only) {
+		ZCG(accelerator_enabled) = 0;
 		return SUCCESS;
 	}