hcrypto: Quell div-by-zero in mp_root_u32()

2023-01-04 02:02:44 -06:00
parent ffd4013be7
commit 1d06e8fcb9
1 changed files with 3 additions and 0 deletions
--- a/lib/hcrypto/libtommath/bn_mp_root_u32.c
+++ b/lib/hcrypto/libtommath/bn_mp_root_u32.c
@@ -23,6 +23,9 @@ mp_err mp_root_u32(const mp_int *a, uint32_t b, mp_int *c)
   if (((b & 1u) == 0u) && (a->sign == MP_NEG)) {
      return MP_VAL;
   }
+   if (b == 0) {
+      return MP_VAL;
+   }

   if ((err = mp_init_multi(&t1, &t2, &t3, NULL)) != MP_OKAY) {
      return err;