diff options
| -rw-r--r-- | core/fpdfapi/page/fpdf_page_func.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp index bf44a1e7c5..6af787ea49 100644 --- a/core/fpdfapi/page/fpdf_page_func.cpp +++ b/core/fpdfapi/page/fpdf_page_func.cpp @@ -376,10 +376,12 @@ FX_BOOL CPDF_PSEngine::DoOperator(PDF_PSOP op) { case PSOP_ROLL: { int j = static_cast<int>(Pop()); int n = static_cast<int>(Pop()); - if (m_StackCount == 0) + if (j == 0 || n == 0 || m_StackCount == 0) break; if (n < 0 || n > static_cast<int>(m_StackCount)) break; + + j %= n; if (j < 0) { for (int i = 0; i < -j; i++) { FX_FLOAT first = m_Stack[m_StackCount - n]; |