Index: mod/kcore/testbin.exe.c
==================================================================
--- mod/kcore/testbin.exe.c
+++ mod/kcore/testbin.exe.c
@@ -28,7 +28,14 @@
 	void* region = alloc.raw;
 	kmzero(region,2048);
 
 	if (kmheapf(region) >= kmcond_fail) return kbad_mem;
 
+	void* top = kmlini();
+	kmres rst = kmlina(1230);
+	if(rst.cond != kmcond_ok) return kbad_mem;
+
+	kmres rst2 = kmlina(789);
+	if(rst2.cond != kmcond_ok) return kbad_mem;
+
 	return kbad_ok;
 }

Index: mod/kmem/heapf.fn.c
==================================================================
--- mod/kmem/heapf.fn.c
+++ mod/kmem/heapf.fn.c
@@ -35,11 +35,11 @@
 		 * (ptr - sizeof sz). see kmheap.c for details. */
 		k_platform_syscall_arg args[] = { (sz)header, total };
 		struct k_platform_syscall_answer r = k_platform_syscall
 			(k_platform_syscall_munmap, Kmsz(args), args);
 
-		if(r.error==0) {
+		if(r.error!=0) {
 			/* we don't need to bother recovering the error
 			 * code, there's only one possible munmap error */
 			return kmcond_bad_address;
 		}