free NULL cleanup

Start ensuring all OpenSSL "free" routines allow NULL, and remove
any if check before calling them.
This gets DH_free, DSA_free, RSA_free

Reviewed-by: Matt Caswell <matt@openssl.org>

10 files changed, 12 insertions, 24 deletions

diff --git a/apps/dh.c b/apps/dh.c
index cdb5f4a1b0..a9216336e5 100644
--- a/apps/dh.c
+++ b/apps/dh.c
@@ -314,8 +314,7 @@ int MAIN(int argc, char **argv)
         BIO_free(in);
     if (out != NULL)
         BIO_free_all(out);
-    if (dh != NULL)
-        DH_free(dh);
+    DH_free(dh);
     apps_shutdown();
     OPENSSL_EXIT(ret);
 }
diff --git a/apps/dhparam.c b/apps/dhparam.c
index 0e6a3c3198..12a2be6455 100644
--- a/apps/dhparam.c
+++ b/apps/dhparam.c
@@ -319,8 +319,7 @@ int MAIN(int argc, char **argv)
             if (!dsa
                 || !DSA_generate_parameters_ex(dsa, num, NULL, 0, NULL, NULL,
                                                cb)) {
-                if (dsa)
-                    DSA_free(dsa);
+                DSA_free(dsa);
                 BN_GENCB_free(cb);
                 ERR_print_errors(bio_err);
                 goto end;
@@ -520,8 +519,7 @@ int MAIN(int argc, char **argv)
         BIO_free(in);
     if (out != NULL)
         BIO_free_all(out);
-    if (dh != NULL)
-        DH_free(dh);
+    DH_free(dh);
     apps_shutdown();
     OPENSSL_EXIT(ret);
 }
diff --git a/apps/dsa.c b/apps/dsa.c
index 7ff6ee960f..8d085bcef2 100644
--- a/apps/dsa.c
+++ b/apps/dsa.c
@@ -360,8 +360,7 @@ int MAIN(int argc, char **argv)
         BIO_free(in);
     if (out != NULL)
         BIO_free_all(out);
-    if (dsa != NULL)
-        DSA_free(dsa);
+    DSA_free(dsa);
     if (passin)
         OPENSSL_free(passin);
     if (passout)
diff --git a/apps/dsaparam.c b/apps/dsaparam.c
index 74eefdc871..fc1c817604 100644
--- a/apps/dsaparam.c
+++ b/apps/dsaparam.c
@@ -438,8 +438,7 @@ int MAIN(int argc, char **argv)
         BIO_free(in);
     if (out != NULL)
         BIO_free_all(out);
-    if (dsa != NULL)
-        DSA_free(dsa);
+    DSA_free(dsa);
     apps_shutdown();
     OPENSSL_EXIT(ret);
 }
diff --git a/apps/gendh.c b/apps/gendh.c
index bbeba06714..6102b79511 100644
--- a/apps/gendh.c
+++ b/apps/gendh.c
@@ -212,8 +212,7 @@ int MAIN(int argc, char **argv)
         ERR_print_errors(bio_err);
     if (out != NULL)
         BIO_free_all(out);
-    if (dh != NULL)
-        DH_free(dh);
+    DH_free(dh);
     if (cb != NULL)
         BN_GENCB_free(cb);
     apps_shutdown();
diff --git a/apps/gendsa.c b/apps/gendsa.c
index fd1360acd5..d330a01002 100644
--- a/apps/gendsa.c
+++ b/apps/gendsa.c
@@ -271,8 +271,7 @@ int MAIN(int argc, char **argv)
         BIO_free(in);
     if (out != NULL)
         BIO_free_all(out);
-    if (dsa != NULL)
-        DSA_free(dsa);
+    DSA_free(dsa);
     if (passout)
         OPENSSL_free(passout);
     apps_shutdown();
diff --git a/apps/genrsa.c b/apps/genrsa.c
index 5770c8d1ec..1b06c82e40 100644
--- a/apps/genrsa.c
+++ b/apps/genrsa.c
@@ -311,8 +311,7 @@ int MAIN(int argc, char **argv)
         BN_free(bn);
     if (cb)
         BN_GENCB_free(cb);
-    if (rsa)
-        RSA_free(rsa);
+    RSA_free(rsa);
     if (out)
         BIO_free_all(out);
     if (passout)
diff --git a/apps/rsa.c b/apps/rsa.c
index 419e50455a..ac4a3c43ef 100644
--- a/apps/rsa.c
+++ b/apps/rsa.c
@@ -424,8 +424,7 @@ int MAIN(int argc, char **argv)
  end:
     if (out != NULL)
         BIO_free_all(out);
-    if (rsa != NULL)
-        RSA_free(rsa);
+    RSA_free(rsa);
     if (passin)
         OPENSSL_free(passin);
     if (passout)
diff --git a/apps/s_server.c b/apps/s_server.c
index 298e665d97..97aa23da19 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -3180,8 +3180,7 @@ static RSA *tmp_rsa_cb(SSL *s, int is_export, int keylength)
         }
         if (!BN_set_word(bn, RSA_F4) || ((rsa_tmp = RSA_new()) == NULL) ||
             !RSA_generate_key_ex(rsa_tmp, keylength, bn, NULL)) {
-            if (rsa_tmp)
-                RSA_free(rsa_tmp);
+            RSA_free(rsa_tmp);
             rsa_tmp = NULL;
         }
         if (!s_quiet) {
diff --git a/apps/speed.c b/apps/speed.c
index 44c276ab21..b023f2877f 100644
--- a/apps/speed.c
+++ b/apps/speed.c
@@ -2448,13 +2448,11 @@ int MAIN(int argc, char **argv)
         OPENSSL_free(buf2_malloc);
 #ifndef OPENSSL_NO_RSA
     for (i = 0; i < RSA_NUM; i++)
-        if (rsa_key[i] != NULL)
-            RSA_free(rsa_key[i]);
+        RSA_free(rsa_key[i]);
 #endif
 #ifndef OPENSSL_NO_DSA
     for (i = 0; i < DSA_NUM; i++)
-        if (dsa_key[i] != NULL)
-            DSA_free(dsa_key[i]);
+        DSA_free(dsa_key[i]);
 #endif
 
 #ifndef OPENSSL_NO_EC