xen/privcmd: return -EFAULT on error
__copy_to_user() returns the number of bytes remaining to be copied but
we want to return a negative error code here.
Acked-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 3b162c6..ef63895 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -389,8 +389,11 @@
state.err = err_array;
ret = traverse_pages(m.num, sizeof(xen_pfn_t),
&pagelist, mmap_return_errors_v1, &state);
- } else if (version == 2)
+ } else if (version == 2) {
ret = __copy_to_user(m.err, err_array, m.num * sizeof(int));
+ if (ret)
+ ret = -EFAULT;
+ }
/* If we have not had any EFAULT-like global errors then set the global
* error to -ENOENT if necessary. */