[PATCH] Check for OOM condition in XISendDeviceHierarchyEvent

[Bryce Harrington]

When system is out of memory, calloc can fail returning a NULL pointer.
Check for this before dereferencing it, and bail out if it fails.

Ref.: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/720445

Signed-off-by: Bryce Harrington <bryce at canonical.com>
---
 Xi/xichangehierarchy.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/Xi/xichangehierarchy.c b/Xi/xichangehierarchy.c
index b9cdedf..21c74ed 100644
--- a/Xi/xichangehierarchy.c
+++ b/Xi/xichangehierarchy.c
@@ -70,6 +70,8 @@ void XISendDeviceHierarchyEvent(int flags[MAXDEVICES])
 
     ev = calloc(1, sizeof(xXIHierarchyEvent) +
                  MAXDEVICES * sizeof(xXIHierarchyInfo));
+    if (!ev)
+        return;
     ev->type = GenericEvent;
     ev->extension = IReqCode;
     ev->evtype = XI_HierarchyChanged;
-- 
1.7.2.3