1 files changed, 7 insertions, 1 deletions
diff --git a/libtommath/bn_mp_read_radix.c b/libtommath/bn_mp_read_radix.c
index 03384e3..a4d1c8a 100644
--- a/libtommath/bn_mp_read_radix.c
+++ b/libtommath/bn_mp_read_radix.c
@@ -71,7 +71,13 @@ int mp_read_radix (mp_int * a, const char *str, int radix)
     }
     ++str;
   }
-  
+
+  /* if an illegal character was found, fail. */
+  if (!(*str == '\0' || *str == '\r' || *str == '\n')) {
+      mp_zero(a);
+      return MP_VAL;
+  }
+
   /* set the sign only if a != 0 */
   if (mp_iszero(a) != MP_YES) {
      a->sign = neg;