free cleanup 12

Don't check for NULL before calling free function.  This gets:
        NAME_CONSTRAINTS_free GENERAL_SUBTREE_free ECDSA_METHOD_free
        JPAKE_CTX_free OCSP_REQ_CTX_free SCT_free SRP_VBASE_free
        SRP_gN_free SRP_user_pwd_free TXT_DB_free

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

apps/apps.c

@@ -600,8 +600,7 @@ int load_cert_crl_http(const char *url, X509 **pcert, X509_CRL **pcrl)
         OPENSSL_free(port);
     if (bio)
         BIO_free_all(bio);
-    if (rctx)
-        OCSP_REQ_CTX_free(rctx);
+    OCSP_REQ_CTX_free(rctx);
     if (rv != 1) {
         BIO_printf(bio_err, "Error loading %s from %s\n",
                    pcert ? "certificate" : "CRL", url);
@@ -1614,8 +1613,7 @@ CA_DB *load_index(char *dbfile, DB_ATTR *db_attr)
  err:
     if (dbattr_conf)
         NCONF_free(dbattr_conf);
-    if (tmpdb)
-        TXT_DB_free(tmpdb);
+    TXT_DB_free(tmpdb);
     BIO_free_all(in);
     return retdb;
 }
@@ -1793,8 +1791,7 @@ int rotate_index(const char *dbfile, const char *new_suffix,
 void free_index(CA_DB *db)
 {
     if (db) {
-        if (db->db)
-            TXT_DB_free(db->db);
+        TXT_DB_free(db->db);
         OPENSSL_free(db);
     }
 }

apps/ocsp.c

@@ -1229,8 +1229,7 @@ static OCSP_RESPONSE *query_responder(BIO *cbio, const char *path,
 
     }
  err:
-    if (ctx)
-        OCSP_REQ_CTX_free(ctx);
+    OCSP_REQ_CTX_free(ctx);
 
     return rsp;
 }

crypto/ecdsa/ecs_lib.c

@@ -312,6 +312,8 @@ void ECDSA_METHOD_set_name(ECDSA_METHOD *ecdsa_method, char *name)
 
 void ECDSA_METHOD_free(ECDSA_METHOD *ecdsa_method)
 {
+    if (!ecdsa_method)
+        return;
     if (ecdsa_method->flags & ECDSA_METHOD_FLAG_ALLOCATED)
         OPENSSL_free(ecdsa_method);
 }

crypto/jpake/jpake.c

@@ -125,6 +125,8 @@ JPAKE_CTX *JPAKE_CTX_new(const char *name, const char *peer_name,
 
 void JPAKE_CTX_free(JPAKE_CTX *ctx)
 {
+    if (!ctx)
+        return;
     JPAKE_CTX_release(ctx);
     OPENSSL_free(ctx);
 }

crypto/ocsp/ocsp_ht.c

@@ -136,6 +136,8 @@ OCSP_REQ_CTX *OCSP_REQ_CTX_new(BIO *io, int maxline)
 
 void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
 {
+    if (!rctx)
+        return;
     BIO_free(rctx->mem);
     if (rctx->iobuf)
         OPENSSL_free(rctx->iobuf);

crypto/srp/srp_vfy.c

@@ -270,13 +270,14 @@ SRP_VBASE *SRP_VBASE_new(char *seed_key)
     return vb;
 }
 
-int SRP_VBASE_free(SRP_VBASE *vb)
+void SRP_VBASE_free(SRP_VBASE *vb)
 {
+    if (!vb)
+        return;
     sk_SRP_user_pwd_pop_free(vb->users_pwd, SRP_user_pwd_free);
     sk_SRP_gN_cache_free(vb->gN_cache);
     OPENSSL_free(vb->seed_key);
     OPENSSL_free(vb);
-    return 0;
 }
 
 static SRP_gN_cache *SRP_gN_new_init(const char *ch)
@@ -457,8 +458,7 @@ int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file)
 
     SRP_user_pwd_free(user_pwd);
 
-    if (tmpdb)
-        TXT_DB_free(tmpdb);
+    TXT_DB_free(tmpdb);
     BIO_free_all(in);
 
     sk_SRP_gN_free(SRP_gN_tab);
@@ -509,7 +509,8 @@ SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username)
          BN_bin2bn(digv, SHA_DIGEST_LENGTH, NULL)))
         return user;
 
- err:SRP_user_pwd_free(user);
+ err:
+    SRP_user_pwd_free(user);
     return NULL;
 }
 

crypto/x509v3/v3_ncons.c

@@ -149,10 +149,8 @@ static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
  memerr:
     X509V3err(X509V3_F_V2I_NAME_CONSTRAINTS, ERR_R_MALLOC_FAILURE);
  err:
-    if (ncons)
-        NAME_CONSTRAINTS_free(ncons);
-    if (sub)
-        GENERAL_SUBTREE_free(sub);
+    NAME_CONSTRAINTS_free(ncons);
+    GENERAL_SUBTREE_free(sub);
 
     return NULL;
 }

crypto/x509v3/v3_scts.c

@@ -161,11 +161,11 @@ static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
 
 static void SCT_free(SCT *sct)
 {
-    if (sct) {
-        if (sct->sct)
-            OPENSSL_free(sct->sct);
-        OPENSSL_free(sct);
-    }
+    if (!sct)
+        return;
+    if (sct->sct)
+        OPENSSL_free(sct->sct);
+    OPENSSL_free(sct);
 }
 
 static void SCT_LIST_free(STACK_OF(SCT) *a)

include/openssl/srp.h

@@ -113,7 +113,7 @@ typedef struct SRP_gN_st {
 DECLARE_STACK_OF(SRP_gN)
 
 SRP_VBASE *SRP_VBASE_new(char *seed_key);
-int SRP_VBASE_free(SRP_VBASE *vb);
+void SRP_VBASE_free(SRP_VBASE *vb);
 int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file);
 SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username);
 char *SRP_create_verifier(const char *user, const char *pass, char **salt,