[PATCH v2] libxl: fix printing hotplug arguments/environment

[Roger Pau Monne <roger.pau@citrix.com>]

An OS could decide to not pass any environment variables to hotplug scripts,
and this will trigger a bug in device_hotplug logic, since it expects the
environment array to exist. Allow env to be NULL.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
---
Changes since v1:
 - Fix commit message
 - Only allow env to be NULL.
---
 tools/libxl/libxl_device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index b9a6df2..dbf157d 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -1130,6 +1130,7 @@ static void device_hotplug(libxl__egc *egc, libxl__ao_device *aodev)
         goto out;
     }
 
+    assert(args != NULL);
     LOG(DEBUG, "calling hotplug script: %s %s", args[0], args[1]);
     LOG(DEBUG, "extra args:");
     {
@@ -1140,7 +1141,7 @@ static void device_hotplug(libxl__egc *egc, libxl__ao_device *aodev)
             LOG(DEBUG, "\t%s", arg);
     }
     LOG(DEBUG, "env:");
-    {
+    if (env != NULL) {
         const char *k, *v;
         unsigned int x;
 
-- 
2.7.4 (Apple Git-66)


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