diff options
| -rw-r--r-- | xen/common/grant_table.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c index 20fee66ef8..a9864d7db7 100644 --- a/xen/common/grant_table.c +++ b/xen/common/grant_table.c @@ -2339,6 +2339,12 @@ __gnttab_swap_grant_ref(grant_ref_t ref_a, grant_ref_t ref_b) spin_lock(>->lock); + /* Bounds check on the grant refs */ + if ( unlikely(ref_a >= nr_grant_entries(d->grant_table))) + PIN_FAIL(out, GNTST_bad_gntref, "Bad ref-a (%d).\n", ref_a); + if ( unlikely(ref_b >= nr_grant_entries(d->grant_table))) + PIN_FAIL(out, GNTST_bad_gntref, "Bad ref-b (%d).\n", ref_b); + act = &active_entry(gt, ref_a); if ( act->pin ) PIN_FAIL(out, GNTST_eagain, "ref a %ld busy\n", (long)ref_a); |