diff --git a/base/third_party/dmg_fp/dtoa.cc b/base/third_party/dmg_fp/dtoa.cc
index c0a51c2..ab4e056 100644
--- a/base/third_party/dmg_fp/dtoa.cc
+++ b/base/third_party/dmg_fp/dtoa.cc
@@ -2674,8 +2674,11 @@ strtod
 			if (c > '0' && c <= '9') {
 				L = c - '0';
 				s1 = s;
-				while((c = *++s) >= '0' && c <= '9')
-					L = 10*L + c - '0';
+				while((c = *++s) >= '0' && c <= '9') {
+					if (L < (INT_MAX - 10) / 10) {
+						L = 10*L + (c - '0');
+					}
+				}
 				if (s - s1 > 8 || L > 19999)
 					/* Avoid confusion from exponents
 					 * so large that e might overflow.