Add error handling for EVP_DigestInit_ex().

A few EVP_DigestInit_ex() calls were left alone since reporting an
error would change the public API.

Changed internal ssl3_cbc_digest_record() to return a value due to the above
change.  It will also now set md_out_size=0 on failure.

This is based on part of BoringSSL's commit to fix malloc crashes:
https://boringssl.googlesource.com/boringssl/+/69a01608f33ab6fe2c3485d94aef1fe9eacf5364

ok miod@

1 files changed, 8 insertions, 4 deletions

diff --git a/src/lib/libssl/s3_clnt.c b/src/lib/libssl/s3_clnt.c
index 47b6824533..d1f2e05eb8 100644
--- a/src/lib/libssl/s3_clnt.c
+++ b/src/lib/libssl/s3_clnt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_clnt.c,v 1.102 2014/12/14 16:19:38 jsing Exp $ */
+/* $OpenBSD: s3_clnt.c,v 1.103 2014/12/15 00:46:53 doug Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -1439,9 +1439,12 @@ ssl3_get_key_exchange(SSL *s)
                         j = 0;
                         q = md_buf;
                         for (num = 2; num > 0; num--) {
-                                EVP_DigestInit_ex(&md_ctx,
+                                if (!EVP_DigestInit_ex(&md_ctx,
                                     (num == 2) ?  s->ctx->md5 : s->ctx->sha1,
-                                    NULL);
+                                    NULL)) {
+                                        al = SSL_AD_INTERNAL_ERROR;
+                                        goto f_err;
+                                }
                                 EVP_DigestUpdate(&md_ctx,
                                     s->s3->client_random,
                                     SSL3_RANDOM_SIZE);
@@ -2245,7 +2248,8 @@ ssl3_send_client_key_exchange(SSL *s)
                                 nid = NID_id_GostR3411_94;
                         else
                                 nid = NID_id_tc26_gost3411_2012_256;
-                        EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid));
+                        if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid)))
+                                goto err;
                         EVP_DigestUpdate(ukm_hash,
                             s->s3->client_random, SSL3_RANDOM_SIZE);
                         EVP_DigestUpdate(ukm_hash,