David Vrabel 5903c6bd1a
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 >
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5903c6bd1a