Bug 1451908 - Check for infinite value in txFormatNumberFunctionCall. r=peterv a=abillings

dom/xslt/xslt/txFormatNumberFunctionCall.cpp

@@ -271,6 +271,12 @@ txFormatNumberFunctionCall::evaluate(txIEvalContext* aContext,
                                                      aResult);
     }
 
+    // Make sure the multiplier didn't push value to infinity.
+    if (value == mozilla::PositiveInfinity<double>()) {
+        return aContext->recycler()->getStringResult(format->mInfinity,
+                                                     aResult);
+    }
+
     // Prefix
     nsAutoString res(prefix);