[PATCH v5 2/3] server: Return STATUS_KEY_DELETED when trying to retrieve the full name of a deleted key.

[Zebediah Figura]

This fixes a server crash that can be triggered by deleting a key and then
trying to retrieve its name. In that case key->parent is NULL.

Signed-off-by: Zebediah Figura 
---
 server/registry.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/server/registry.c b/server/registry.c
index f36760e6cc1..b7971770728 100644
--- a/server/registry.c
+++ b/server/registry.c
@@ -413,6 +413,12 @@ static WCHAR *key_get_full_name( struct object *obj, data_size_t *ret_len )
     data_size_t len = sizeof(root_name) - sizeof(WCHAR);
     char *ret;

+    if (key->flags & KEY_DELETED)
+    {
+        set_error( STATUS_KEY_DELETED );
+        return NULL;
+    }
+
     for (key = (struct key *)obj; key != root_key; key = key->parent) len += key->namelen + sizeof(WCHAR);
     if (!(ret = malloc( len ))) return NULL;