# HG changeset patch
# User Brendan Cully <brendan@xxxxxxxxx>
# Date 1264023273 28800
# Node ID fe58c98dd43f370b5461e3ad451b2520dd6b9e2e
# Parent  b0b41e735575ec6fc1d7d56f3cffa9246058881a
xc_map_foreign_bulk: unconditionally prezero error array

MMAPBATCH_V2 does not touch the array unless a mapping fails, so it
is up to the caller to zero it before making the ioctl.

Signed-off-by: Brendan Cully <brendan@xxxxxxxxx>

diff --git a/tools/libxc/xc_linux.c b/tools/libxc/xc_linux.c
--- a/tools/libxc/xc_linux.c
+++ b/tools/libxc/xc_linux.c
@@ -159,6 +159,9 @@
     ioctlx.arr = arr;
     ioctlx.err = err;
 
+    if (num > 0)
+        memset(err, 0, sizeof(*err) * num);
+
     rc = ioctl(xc_handle, IOCTL_PRIVCMD_MMAPBATCH_V2, &ioctlx);
 
     if ( rc < 0 && errno == ENOENT )