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-rw-r--r--libX11/src/ModMap.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/libX11/src/ModMap.c b/libX11/src/ModMap.c
index 04cd676eb..836a67621 100644
--- a/libX11/src/ModMap.c
+++ b/libX11/src/ModMap.c
@@ -65,9 +65,9 @@ XGetModifierMapping(register Display *dpy)
/*
* Returns:
- * 0 Success
- * 1 Busy - one or more old or new modifiers are down
- * 2 Failed - one or more new modifiers unacceptable
+ * MappingSuccess (0) Success
+ * MappingBusy (1) Busy - one or more old or new modifiers are down
+ * MappingFailed (2) Failed - one or more new modifiers unacceptable
*/
int
XSetModifierMapping(
@@ -80,6 +80,10 @@ XSetModifierMapping(
LockDisplay(dpy);
GetReqExtra(SetModifierMapping, mapSize, req);
+ if (!req) {
+ UnlockDisplay(dpy);
+ return MappingFailed;
+ }
req->numKeyPerModifier = modifier_map->max_keypermod;