sanity check in kmalloc

76e79edd · Nickolai Zeldovich · 99569f4c · 76e79edd
--- a/kernel/kmalloc.cc
+++ b/kernel/kmalloc.cc
@@ -43,6 +43,7 @@ morecore(int c, int b)
    return -1;

  int sz = 1 << b;
+  assert(sz >= sizeof(header));
  for(char *q = p; q + sz <= p + PGSIZE; q += sz){
    struct header *h = (struct header *) q;
    h->next = freelists[c].buckets[b];