[PATCH 09 of 10] libxl: Do not SEGV when no 'removable' disk parameter in xenstore

[Marek Marczykowski <marmarek@mimuw.edu.pl>]

# HG changeset patch
# User Marek Marczykowski <marmarek@mimuw.edu.pl>
# Date 1306963174 -7200
# Node ID 10bdf8aa5b8a1cb2178f2b9cbcc9ce2fd5644403
# Parent  d03bd7a830bff8162b6b0564d27b3f36ca52d8bb
libxl: Do not SEGV when no 'removable' disk parameter in xenstore

Just assume disk as not removable when no 'removable' paremeter

Signed-off-by: Marek Marczykowski <marmarek@mimuw.edu.pl>

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1722,6 +1722,7 @@
                              libxl__xs_get_dompath(&gc, 0), type, domid);
     dir = libxl__xs_directory(&gc, XBT_NULL, be_path, &n);
     if (dir) {
+        char *removable;
         *disks = realloc(*disks, sizeof (libxl_device_disk) * (*ndisks + n));
         pdisk = *disks + *ndisks;
         *ndisks += n;
@@ -1740,7 +1741,11 @@
                 libxl__sprintf(&gc, "%s/%s/type", be_path, *dir)), 
                 &(pdisk->backend));
             pdisk->vdev = xs_read(ctx->xsh, XBT_NULL, libxl__sprintf(&gc, "%s/%s/dev", be_path, *dir), &len);
-            pdisk->unpluggable = atoi(libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/%s/removable", be_path, *dir)));
+            removable = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/%s/removable", be_path, *dir));
+            if (removable)
+                pdisk->unpluggable = atoi(removable);
+            else
+                pdisk->unpluggable = 0;
             if (!strcmp(libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/%s/mode", be_path, *dir)), "w"))
                 pdisk->readwrite = 1;
             else