diff -p -u -r1.5 ptimer.c
--- hw/ptimer.c	17 Nov 2007 17:14:47 -0000	1.5
+++ hw/ptimer.c	3 Jan 2008 02:27:18 -0000
@@ -185,6 +185,8 @@ ptimer_state *ptimer_init(QEMUBH *bh)
     ptimer_state *s;
 
     s = (ptimer_state *)qemu_mallocz(sizeof(ptimer_state));
+    if (!s)
+        return NULL;
     s->bh = bh;
     s->timer = qemu_new_timer(vm_clock, ptimer_tick, s);
     return s;