Add check for EVP_CIPHER_CTX_ctrl

suggestion from tb@

1 files changed, 6 insertions, 4 deletions

diff --git a/src/lib/libcrypto/evp/e_rc2.c b/src/lib/libcrypto/evp/e_rc2.c
index d8c331d535..b07fafddfd 100644
--- a/src/lib/libcrypto/evp/e_rc2.c
+++ b/src/lib/libcrypto/evp/e_rc2.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: e_rc2.c,v 1.13 2022/01/20 11:22:48 inoguchi Exp $ */
+/* $OpenBSD: e_rc2.c,v 1.14 2022/01/20 11:31:37 inoguchi Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -150,7 +150,8 @@ rc2_meth_to_magic(EVP_CIPHER_CTX *e)
 {
         int i;
 
-        EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i);
+        if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)
+                return (0);
         if (i == 128)
                 return (RC2_128_MAGIC);
         else if (i == 64)
@@ -199,8 +200,9 @@ rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)
                         return (-1);
                 if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))
                         return -1;
-                EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS,
-                    key_bits, NULL);
+                if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS,
+                    key_bits, NULL) <= 0)
+                        return -1;
                 if (!EVP_CIPHER_CTX_set_key_length(c, key_bits / 8))
                         return -1;
         }