Prevented modification of interned string

diff --git a/ext/standard/string.c b/ext/standard/string.c
index 290fa21879e026acc4dbb6c778fcf96cc941a1e7..764f82150ced399f7c7ac4210695762ccb0aa608 100644 (file)
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -4283,12 +4283,23 @@ PHP_FUNCTION(strip_tags)
        /* To maintain a certain BC, we allow anything for the second parameter and return original string */
        if (allow != NULL) {
                convert_to_string_ex(allow);
-               allowed_tags = Z_STRVAL_P(allow);
-               allowed_tags_len = Z_STRLEN_P(allow);
+// TODO: reimplement to avoid reallocation ???
+               if (IS_INTERNED(Z_STR_P(allow))) {
+                       allowed_tags = estrndup(Z_STRVAL_P(allow), Z_STRLEN_P(allow));
+                       allowed_tags_len = Z_STRLEN_P(allow);
+               } else {
+                       allowed_tags = Z_STRVAL_P(allow);
+                       allowed_tags_len = Z_STRLEN_P(allow);
+               }
        }
 
        buf = STR_INIT(str, str_len, 0);
        buf->len = php_strip_tags_ex(buf->val, str_len, NULL, allowed_tags, allowed_tags_len, 0);
+
+// TODO: reimplement to avoid reallocation ???
+       if (allow && IS_INTERNED(Z_STR_P(allow))) {
+               efree(allowed_tags);
+       }
        RETURN_STR(buf);
 }
 /* }}} */