free NULL cleanup 7

This gets BN_.*free:
    BN_BLINDING_free BN_CTX_free BN_FLG_FREE BN_GENCB_free
    BN_MONT_CTX_free BN_RECP_CTX_free BN_clear_free BN_free BUF_MEM_free

Also fix a call to DSA_SIG_free to ccgost engine and remove some #ifdef'd
dead code in engines/e_ubsec.

Reviewed-by: Richard Levitte <levitte@openssl.org>

5 files changed, 17 insertions, 32 deletions

diff --git a/crypto/dh/dh_ameth.c b/crypto/dh/dh_ameth.c
index f3abe0774f..6a4223c167 100644
--- a/crypto/dh/dh_ameth.c
+++ b/crypto/dh/dh_ameth.c
@@ -463,8 +463,7 @@ static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src)
             return 0;
     } else
         a = NULL;
-    if (*dst)
-        BN_free(*dst);
+    BN_free(*dst);
     *dst = a;
     return 1;
 }
diff --git a/crypto/dh/dh_check.c b/crypto/dh/dh_check.c
index 7a8e063fc8..b8b3890d9e 100644
--- a/crypto/dh/dh_check.c
+++ b/crypto/dh/dh_check.c
@@ -159,7 +159,6 @@ int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *ret)
 
     ok = 1;
  err:
-    if (q != NULL)
-        BN_free(q);
+    BN_free(q);
     return (ok);
 }
diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c
index 9e2c8b26e6..e2f48b142d 100644
--- a/crypto/dh/dh_key.c
+++ b/crypto/dh/dh_key.c
@@ -172,12 +172,10 @@ static int generate_key(DH *dh)
             prk = priv_key;
 
         if (!dh->meth->bn_mod_exp(dh, pub_key, dh->g, prk, dh->p, ctx, mont)) {
-            if (local_prk)
-                BN_free(local_prk);
+            BN_free(local_prk);
             goto err;
         }
-        if (local_prk)
-            BN_free(local_prk);
+        BN_free(local_prk);
     }
 
     dh->pub_key = pub_key;
@@ -187,9 +185,9 @@ static int generate_key(DH *dh)
     if (ok != 1)
         DHerr(DH_F_GENERATE_KEY, ERR_R_BN_LIB);
 
-    if ((pub_key != NULL) && (dh->pub_key == NULL))
+    if (pub_key != dh->pub_key)
         BN_free(pub_key);
-    if ((priv_key != NULL) && (dh->priv_key == NULL))
+    if (priv_key != dh->priv_key)
         BN_free(priv_key);
     BN_CTX_free(ctx);
     return (ok);
@@ -273,7 +271,6 @@ static int dh_init(DH *dh)
 
 static int dh_finish(DH *dh)
 {
-    if (dh->method_mont_p)
-        BN_MONT_CTX_free(dh->method_mont_p);
+    BN_MONT_CTX_free(dh->method_mont_p);
     return (1);
 }
diff --git a/crypto/dh/dh_lib.c b/crypto/dh/dh_lib.c
index 68a54a6fd2..74bad4dfcf 100644
--- a/crypto/dh/dh_lib.c
+++ b/crypto/dh/dh_lib.c
@@ -194,22 +194,15 @@ void DH_free(DH *r)
 
     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 
-    if (r->p != NULL)
-        BN_clear_free(r->p);
-    if (r->g != NULL)
-        BN_clear_free(r->g);
-    if (r->q != NULL)
-        BN_clear_free(r->q);
-    if (r->j != NULL)
-        BN_clear_free(r->j);
+    BN_clear_free(r->p);
+    BN_clear_free(r->g);
+    BN_clear_free(r->q);
+    BN_clear_free(r->j);
     if (r->seed)
         OPENSSL_free(r->seed);
-    if (r->counter != NULL)
-        BN_clear_free(r->counter);
-    if (r->pub_key != NULL)
-        BN_clear_free(r->pub_key);
-    if (r->priv_key != NULL)
-        BN_clear_free(r->priv_key);
+    BN_clear_free(r->counter);
+    BN_clear_free(r->pub_key);
+    BN_clear_free(r->priv_key);
     OPENSSL_free(r);
 }
 
diff --git a/crypto/dh/dh_pmeth.c b/crypto/dh/dh_pmeth.c
index e3ebc0201d..069b855aa0 100644
--- a/crypto/dh/dh_pmeth.c
+++ b/crypto/dh/dh_pmeth.c
@@ -383,8 +383,7 @@ static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
     if (dctx->use_dsa) {
         DSA *dsa_dh;
         dsa_dh = dsa_dh_generate(dctx, pcb);
-        if (pcb)
-            BN_GENCB_free(pcb);
+        BN_GENCB_free(pcb);
         if (!dsa_dh)
             return 0;
         dh = DSA_dup_DH(dsa_dh);
@@ -397,14 +396,12 @@ static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 #endif
     dh = DH_new();
     if (!dh) {
-        if (pcb)
-            BN_GENCB_free(pcb);
+        BN_GENCB_free(pcb);
         return 0;
     }
     ret = DH_generate_parameters_ex(dh,
                                     dctx->prime_len, dctx->generator, pcb);
-    if (pcb)
-        BN_GENCB_free(pcb);
+    BN_GENCB_free(pcb);
     if (ret)
         EVP_PKEY_assign_DH(pkey, dh);
     else