Index: core/fpdfapi/page/fpdf_page_func.cpp |
diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp |
index bf44a1e7c5666b49f9a3c4faff099c240ebf7018..6af787ea4977f6e57d9721ea24f9ac8fc0e68548 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]; |