xen/gntalloc: safely delete grefs in add_grefs() undo path

If a gref could not be added (perhaps because the limit has been
reached or there are no more grant references available), the undo
path may crash because __del_gref() frees the gref while it is being
used for a list iteration.

A comment suggests that using list_for_each_entry() is safe since the
gref isn't removed from the list being iterated over, but it is freed
and thus list_for_each_entry_safe() must be used.

Also, explicitly delete the gref from the local per-file list, even
though this is not strictly necessary.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 8ed2bb4..e53fe19 100644 (file)
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -124,7 +124,7 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
        int i, rc, readonly;
        LIST_HEAD(queue_gref);
        LIST_HEAD(queue_file);
-       struct gntalloc_gref *gref;
+       struct gntalloc_gref *gref, *next;
 
        readonly = !(op->flags & GNTALLOC_FLAG_WRITABLE);
        rc = -ENOMEM;
@@ -160,8 +160,8 @@ undo:
        mutex_lock(&gref_mutex);
        gref_size -= (op->count - i);
 
-       list_for_each_entry(gref, &queue_file, next_file) {
-               /* __del_gref does not remove from queue_file */
+       list_for_each_entry_safe(gref, next, &queue_file, next_file) {
+               list_del(&gref->next_file);
                __del_gref(gref);
        }