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-rw-r--r--core/fpdfapi/page/fpdf_page_func.cpp9
1 files changed, 6 insertions, 3 deletions
diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp
index 9949e052c9..916641f05d 100644
--- a/core/fpdfapi/page/fpdf_page_func.cpp
+++ b/core/fpdfapi/page/fpdf_page_func.cpp
@@ -410,12 +410,15 @@ bool CPDF_PSEngine::DoOperator(PDF_PSOP op) {
break;
case PSOP_BITSHIFT: {
int shift = (int)Pop();
- int i = (int)Pop();
+ result = (int)Pop();
if (shift > 0) {
- Push(i << shift);
+ result <<= shift;
} else {
- Push(i >> -shift);
+ // Avoids unsafe negation of INT_MIN.
+ FX_SAFE_INT32 safe_shift = shift;
+ result >>= (-safe_shift).ValueOrDefault(0);
}
+ Push(result.ValueOrDefault(0));
break;
}
case PSOP_TRUE: