hbitmap: add 'pos < size' asserts

For now, fail in hbitmap_set on start + count > size will come from
hbitmap_set
  hb_count_between
    hbitmap_iter_init
      assert(pos < hb->size)

This patch adds such checks to set/get/reset functions of hbitmap.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 1465924093-76875-2-git-send-email-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

util/hbitmap.c

@@ -269,6 +269,7 @@ void hbitmap_set(HBitmap *hb, uint64_t start, uint64_t count)
     start >>= hb->granularity;
     last >>= hb->granularity;
     count = last - start + 1;
+    assert(last < hb->size);
 
     hb->count += count - hb_count_between(hb, start, last);
     hb_set_between(hb, HBITMAP_LEVELS - 1, start, last);
@@ -348,6 +349,7 @@ void hbitmap_reset(HBitmap *hb, uint64_t start, uint64_t count)
 
     start >>= hb->granularity;
     last >>= hb->granularity;
+    assert(last < hb->size);
 
     hb->count -= hb_count_between(hb, start, last);
     hb_reset_between(hb, HBITMAP_LEVELS - 1, start, last);
@@ -371,6 +373,7 @@ bool hbitmap_get(const HBitmap *hb, uint64_t item)
     /* Compute position and bit in the last layer.  */
     uint64_t pos = item >> hb->granularity;
     unsigned long bit = 1UL << (pos & (BITS_PER_LONG - 1));
+    assert(pos < hb->size);
 
     return (hb->levels[HBITMAP_LEVELS - 1][pos >> BITS_PER_LEVEL] & bit) != 0;
 }