TSRM: roll back id_count when the resource type table cannot grow

ts_allocate_id(), ts_allocate_fast_id_at() and ts_allocate_tls_id()
increment id_count before growing resource_types_table. When the
realloc fails they return 0 with id_count still counting the new slot,
so allocate_new_resource() later walks j < id_count and reads an entry
that was never initialized. Roll id_count back on those three paths.

Author: iliaal

TSRM/TSRM.c

@@ -305,6 +305,7 @@ TSRM_API ts_rsrc_id ts_allocate_id(ts_rsrc_id *rsrc_id, size_t size, ts_allocate
 		_tmp = (tsrm_resource_type *) realloc(resource_types_table, sizeof(tsrm_resource_type)*id_count);
 		if (!_tmp) {
 			TSRM_ERROR((TSRM_ERROR_LEVEL_ERROR, "Unable to allocate storage for resource"));
+			id_count--;
 			*rsrc_id = 0;
 			tsrm_mutex_unlock(tsmm_mutex);
 			return 0;
@@ -384,6 +385,7 @@ TSRM_API ts_rsrc_id ts_allocate_fast_id_at(ts_rsrc_id *rsrc_id, size_t *offset,
 		_tmp = (tsrm_resource_type *) realloc(resource_types_table, sizeof(tsrm_resource_type)*id_count);
 		if (!_tmp) {
 			TSRM_ERROR((TSRM_ERROR_LEVEL_ERROR, "Unable to allocate storage for resource"));
+			id_count--;
 			*rsrc_id = 0;
 			tsrm_mutex_unlock(tsmm_mutex);
 			return 0;
@@ -419,6 +421,7 @@ TSRM_API ts_rsrc_id ts_allocate_tls_id(ts_rsrc_id *rsrc_id, void *(*tls_addr)(vo
 		_tmp = (tsrm_resource_type *) realloc(resource_types_table, sizeof(tsrm_resource_type)*id_count);
 		if (!_tmp) {
 			TSRM_ERROR((TSRM_ERROR_LEVEL_ERROR, "Unable to allocate storage for resource"));
+			id_count--;
 			*rsrc_id = 0;
 			tsrm_mutex_unlock(tsmm_mutex);
 			return 0;