Add a constant time flag to one of the bignums to avoid a timing leak.

paulidale · paulidale · commit 26d7fce13d46 · 2018-11-02T08:15:37.000+10:00
Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from #7549) (cherry picked from commit 00496b6)
diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
@@ -225,6 +225,7 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in,
     } while (BN_is_zero(k));
 
     BN_set_flags(k, BN_FLG_CONSTTIME);
+    BN_set_flags(l, BN_FLG_CONSTTIME);
 
     if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
         if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
