fix possible crashes of invaild drawing

sorayuki · Feb 26, 2021 · ac3a72b · ac3a72b
1 parent 49c31e5
commit ac3a72b
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/subtitles/RTS.cpp b/src/subtitles/RTS.cpp
@@ -750,6 +750,7 @@ bool CPolygon::ParseStr()
  }
  break;
  case 'l':
+ if (m_pathPointsOrg.GetCount() < 1) break;
  while(GetPOINT(s, p))
  {
  m_pathTypesOrg.Add(PT_LINETO);
@@ -758,6 +759,7 @@ bool CPolygon::ParseStr()
  break;
  case 'b':
  j = m_pathTypesOrg.GetCount();
+ if (j < 1) break;
  while(GetPOINT(s, p))
  {
  m_pathTypesOrg.Add(PT_BEZIERTO);
@@ -769,6 +771,7 @@ bool CPolygon::ParseStr()
  m_pathPointsOrg.SetCount(j);
  break;
  case 's':
+ if (m_pathPointsOrg.GetCount() < 1) break;
  j = lastsplinestart = m_pathTypesOrg.GetCount();
  i = 3;
  while(i-- && GetPOINT(s, p))
@@ -785,6 +788,7 @@ bool CPolygon::ParseStr()
  }
  // no break here
  case 'p':
+ if (m_pathPointsOrg.GetCount() < 3) break;
  while(GetPOINT(s, p))
  {
  m_pathTypesOrg.Add(PT_BSPLINEPATCHTO);