Code: void Segment::PreloadCluster(Cluster* pCluster, ptrdiff_t idx) {
   assert(pCluster);
   assert(pCluster->m_index < 0);
   assert(idx >= m_clusterCount);

 const long count = m_clusterCount + m_clusterPreloadCount;

 long& size = m_clusterSize;
  assert(size >= count);


   if (count >= size) {
     const long n = (size <= 0) ? 2048 : 2 * size;
 
    Cluster** const qq = new Cluster* [n];
     Cluster** q = qq;
 
     Cluster** p = m_clusters;
 Cluster** const pp = p + count;

 while (p != pp)
 *q++ = *p++;

 delete[] m_clusters;

    m_clusters = qq;
    size = n;
 }

  assert(m_clusters);

 Cluster** const p = m_clusters + idx;

 Cluster** q = m_clusters + count;
  assert(q >= p);
  assert(q < (m_clusters + size));

 while (q > p) {
 Cluster** const qq = q - 1;
    assert((*qq)->m_index < 0);

 *q = *qq;
    q = qq;
 }

 
   m_clusters[idx] = pCluster;
   ++m_clusterPreloadCount;
 }

Vulnerability Type: DoS Exec Code Mem. Corr. 
CWE ID: CWE-20
Summary: libvpx in libwebm in mediaserver in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-06-01 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted mkv file, aka internal bug 23167726.
Commit Message: external/libvpx/libwebm: Update snapshot

Update libwebm snapshot. This update contains security fixes from upstream.

Upstream git hash: 229f49347d19b0ca0941e072b199a242ef6c5f2b

BUG=23167726

Change-Id: Id3e140e7b31ae11294724b1ecfe2e9c83b4d4207
(cherry picked from commit d0281a15b3c6bd91756e453cc9398c5ef412d99a)
