[Merge to M56] Verify precision length before converting to string.
This CL updates the CalculateString method to make sure the number of digits
of precision is valid before doing the stringstream conversion.
BUG=chromium:673336
TBR=tsepez@chromium.org
Review-Url: https://codereview.chromium.org/2572543004
(cherry picked from commit 992ecf7c189e5cabf43e5ad862511cf63d030966)
Review-Url: https://codereview.chromium.org/2623013002 .
diff --git a/fpdfsdk/javascript/PublicMethods.cpp b/fpdfsdk/javascript/PublicMethods.cpp
index bfe48d5..c0ea84c 100644
--- a/fpdfsdk/javascript/PublicMethods.cpp
+++ b/fpdfsdk/javascript/PublicMethods.cpp
@@ -8,6 +8,7 @@
#include <algorithm>
#include <iomanip>
+#include <limits>
#include <sstream>
#include <string>
#include <vector>
@@ -95,6 +96,11 @@
*bNegative = dValue < 0;
if (*bNegative)
dValue = -dValue;
+
+ // Make sure the number of precision characters will fit.
+ if (iDec > std::numeric_limits<double>::digits10)
+ iDec = std::numeric_limits<double>::digits10;
+
std::stringstream ss;
ss << std::fixed << std::setprecision(iDec) << dValue;
std::string stringValue = ss.str();
