cp-demangle.c (d_number): Avoid signed int overflow.

2019-10-29 Paul Pluzhnikov  <ppluzhnikov@google.com>

	* cp-demangle.c (d_number): Avoid signed int overflow.

From-SVN: r277575

libiberty/ChangeLog

+2019-10-29 Paul Pluzhnikov  <ppluzhnikov@google.com>
+
+	* cp-demangle.c (d_number): Avoid signed int overflow.
+
 2019-10-28  Miguel Saldivar  <saldivarcher@gmail.com>
 
 	* cp-demangle.c (d_print_mod): Add a space before printing `complex`

libiberty/cp-demangle.c

@@ -1717,7 +1717,7 @@ d_number (struct d_info *di)
 	}
       if (ret > ((INT_MAX - (peek - '0')) / 10))
         return -1;
-      ret = ret * 10 + peek - '0';
+      ret = ret * 10 + (peek - '0');
       d_advance (di, 1);
       peek = d_peek_char (di);
     }