Avoid null pointer UB in accel blacklist

Pretty annoying...

diff --git a/ext/opcache/zend_accelerator_blacklist.c b/ext/opcache/zend_accelerator_blacklist.c
index 889fcabd798875f40181c3c780f61719b4726805..9ae897b521146e5d828bf7e061203373e4fea52b 100644 (file)
--- a/ext/opcache/zend_accelerator_blacklist.c
+++ b/ext/opcache/zend_accelerator_blacklist.c
@@ -205,8 +205,11 @@ static void zend_accel_blacklist_update_regexp(zend_blacklist *blacklist)
 
 void zend_accel_blacklist_shutdown(zend_blacklist *blacklist)
 {
-       zend_blacklist_entry *p = blacklist->entries, *end = blacklist->entries + blacklist->pos;
+       if (!blacklist->entries) {
+               return;
+       }
 
+       zend_blacklist_entry *p = blacklist->entries, *end = blacklist->entries + blacklist->pos;
        while (p<end) {
                free(p->path);
                p++;