[Xen-devel] [PATCH] gnttab: fix "don't use possibly unbounded tail calls"

["Jan Beulich" <JBeulich@xxxxxxxx>]

The compat mode code also needs adjustment to deal with the changed
return value from gnttab_copy().

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/common/compat/grant_table.c
+++ b/xen/common/compat/grant_table.c
@@ -258,9 +258,9 @@ int compat_grant_table_op(unsigned int c
                 rc = gnttab_copy(guest_handle_cast(nat.uop, gnttab_copy_t), n);
             if ( rc > 0 )
             {
-                ASSERT(rc < n);
-                i -= n - rc;
-                n = rc;
+                ASSERT(rc <= n);
+                i -= rc;
+                n -= rc;
             }
             if ( rc >= 0 )
             {




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