deps: float ea7abee from openssl / CVE-2018-0732

Pending OpenSSL 1.1.0i release.

PR-URL: #21282
Reviewed-By: Shigeki Ohtsu <ohtsu@ohtsu.org>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Upstream: openssl/openssl@ea7abee

Original commit message:

    Reject excessively large primes in DH key generation.

    CVE-2018-0732

    Signed-off-by: Guido Vranken <guidovranken@gmail.com>

    (cherry picked from commit 91f7361f47b082ae61ffe1a7b17bb2adf213c7fe)

    Reviewed-by: Tim Hudson <tjh@openssl.org>
    Reviewed-by: Matt Caswell <matt@openssl.org>
    (Merged from openssl/openssl#6457)

Author: rvagg

deps/openssl/openssl/crypto/dh/dh_key.c

@@ -78,10 +78,15 @@ static int generate_key(DH *dh)
     int ok = 0;
     int generate_new_key = 0;
     unsigned l;
-    BN_CTX *ctx;
+    BN_CTX *ctx = NULL;
     BN_MONT_CTX *mont = NULL;
     BIGNUM *pub_key = NULL, *priv_key = NULL;
 
+    if (BN_num_bits(dh->p) > OPENSSL_DH_MAX_MODULUS_BITS) {
+        DHerr(DH_F_GENERATE_KEY, DH_R_MODULUS_TOO_LARGE);
+        return 0;
+    }
+
     ctx = BN_CTX_new();
     if (ctx == NULL)
         goto err;