xkbcomp: Ensure at least keycodes supplied in components

It seems that at least a non-empty keycodes component is required to
compile a XkbcDescPtr.

diff --git a/src/xkbcomp/xkbcomp.c b/src/xkbcomp/xkbcomp.c
index 3cfde6a573f88b991122a66e61fe933708439c6c..450c4594fac6b96ea15cf61fe22e2a610ece19cf 100644 (file)
--- a/src/xkbcomp/xkbcomp.c
+++ b/src/xkbcomp/xkbcomp.c
@@ -155,6 +155,11 @@ XkbcCompileKeymapFromComponents(XkbComponentNamesPtr ktcsg)
     XkbFile *file, *mapToUse;
     XkbcDescPtr xkb;
 
+    if (!ktcsg || ISEMPTY(ktcsg->keycodes)) {
+        ERROR("keycodes required to generate XKB keymap\n");
+        goto fail;
+    }
+
     if (!(file = XkbKeymapFileFromComponents(ktcsg))) {
         ERROR("failed to generate parsed XKB file from components\n");
         goto fail;