If the XGetDeviceDontPropagateList reply has an invalid length, return 0

If we skip over the reply data, return 0 as number of event classes.

Follow-up to 6dd6dc51a2935c72774be81e5cc2ba2c30e9feff.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/XGetProp.c b/src/XGetProp.c
index b49328c..8c69ef2 100644
--- a/src/XGetProp.c
+++ b/src/XGetProp.c
@@ -104,8 +104,10 @@ XGetDeviceDontPropagateList(
 		_XRead(dpy, (char *)(&ec), sizeof(CARD32));
 		list[i] = (XEventClass) ec;
 	    }
-	} else
+	} else {
+            *count = 0;
 	    _XEatDataWords(dpy, rep.length);
+        }
     }
 
     UnlockDisplay(dpy);