DSA mod inverse fix

[openssl.git] / crypto / dsa / dsa_meth.c

diff --git a/crypto/dsa/dsa_meth.c b/crypto/dsa/dsa_meth.c
index 816e35ecc528c5668f6577dd9b0092de3b30e572..ff4fae44a7c309d6f1dc4ddddea4469a773e783f 100644 (file)
--- a/crypto/dsa/dsa_meth.c
+++ b/crypto/dsa/dsa_meth.c
@@ -1,3 +1,12 @@
+/*
+ * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
 /*
  * Licensed under the OpenSSL licenses, (the "License");
  * you may not use this file except in compliance with the License.
@@ -8,40 +17,50 @@
 
 #include "dsa_locl.h"
 #include <string.h>
+#include <openssl/err.h>
 
 DSA_METHOD *DSA_meth_new(const char *name, int flags)
 {
-    DSA_METHOD *dsam = OPENSSL_zalloc(sizeof(DSA_METHOD));
+    DSA_METHOD *dsam = OPENSSL_zalloc(sizeof(*dsam));
 
     if (dsam != NULL) {
-        dsam->name = OPENSSL_strdup(name);
         dsam->flags = flags;
+
+        dsam->name = OPENSSL_strdup(name);
+        if (dsam->name != NULL)
+            return dsam;
+
+        OPENSSL_free(dsam);
     }
 
-    return dsam;
+    DSAerr(DSA_F_DSA_METH_NEW, ERR_R_MALLOC_FAILURE);
+    return NULL;
 }
 
 void DSA_meth_free(DSA_METHOD *dsam)
 {
     if (dsam != NULL) {
-        if (dsam->name != NULL)
-            OPENSSL_free(dsam->name);
+        OPENSSL_free(dsam->name);
         OPENSSL_free(dsam);
     }
 }
 
 DSA_METHOD *DSA_meth_dup(const DSA_METHOD *dsam)
 {
-    DSA_METHOD *ret;
-
-    ret = OPENSSL_malloc(sizeof(DSA_METHOD));
+    DSA_METHOD *ret = OPENSSL_malloc(sizeof(*ret));
 
     if (ret != NULL) {
         memcpy(ret, dsam, sizeof(*dsam));
+
         ret->name = OPENSSL_strdup(dsam->name);
+        if (ret->name != NULL)
+            return ret;
+
+        OPENSSL_free(ret);
     }
 
-    return ret;
+    DSAerr(DSA_F_DSA_METH_DUP, ERR_R_MALLOC_FAILURE);
+    return NULL;
 }
 
 const char *DSA_meth_get0_name(const DSA_METHOD *dsam)
@@ -51,13 +70,20 @@ const char *DSA_meth_get0_name(const DSA_METHOD *dsam)
 
 int DSA_meth_set1_name(DSA_METHOD *dsam, const char *name)
 {
+    char *tmpname = OPENSSL_strdup(name);
+
+    if (tmpname == NULL) {
+        DSAerr(DSA_F_DSA_METH_SET1_NAME, ERR_R_MALLOC_FAILURE);
+        return 0;
+    }
+
     OPENSSL_free(dsam->name);
-    dsam->name = OPENSSL_strdup(name);
+    dsam->name = tmpname;
 
-    return dsam->name != NULL;
+    return 1;
 }
 
-int DSA_meth_get_flags(DSA_METHOD *dsam)
+int DSA_meth_get_flags(const DSA_METHOD *dsam)
 {
     return dsam->flags;
 }
@@ -106,7 +132,7 @@ int DSA_meth_set_sign_setup(DSA_METHOD *dsam,
 }
 
 int (*DSA_meth_get_verify(const DSA_METHOD *dsam))
-        (const unsigned char *, int , DSA_SIG *, DSA *)
+        (const unsigned char *, int, DSA_SIG *, DSA *)
 {
     return dsam->dsa_do_verify;
 }
@@ -119,29 +145,30 @@ int DSA_meth_set_verify(DSA_METHOD *dsam,
 }
 
 int (*DSA_meth_get_mod_exp(const DSA_METHOD *dsam))
-        (DSA *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *,
-         BN_CTX *, BN_MONT_CTX *)
+        (DSA *, BIGNUM *, const BIGNUM *, const BIGNUM *, const BIGNUM *,
+         const BIGNUM *, const BIGNUM *, BN_CTX *, BN_MONT_CTX *)
 {
     return dsam->dsa_mod_exp;
 }
 
 int DSA_meth_set_mod_exp(DSA_METHOD *dsam,
-    int (*mod_exp) (DSA *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *,
-                    BIGNUM *, BN_CTX *, BN_MONT_CTX *))
+    int (*mod_exp) (DSA *, BIGNUM *, const BIGNUM *, const BIGNUM *,
+                    const BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *,
+                    BN_MONT_CTX *))
 {
     dsam->dsa_mod_exp = mod_exp;
     return 1;
 }
 
 int (*DSA_meth_get_bn_mod_exp(const DSA_METHOD *dsam))
-    (DSA *, BIGNUM *, BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *,
+    (DSA *, BIGNUM *, const BIGNUM *, const BIGNUM *, const BIGNUM *, BN_CTX *,
      BN_MONT_CTX *)
 {
     return dsam->bn_mod_exp;
 }
 
 int DSA_meth_set_bn_mod_exp(DSA_METHOD *dsam,
-    int (*bn_mod_exp) (DSA *, BIGNUM *, BIGNUM *, const BIGNUM *,
+    int (*bn_mod_exp) (DSA *, BIGNUM *, const BIGNUM *, const BIGNUM *,
                        const BIGNUM *, BN_CTX *, BN_MONT_CTX *))
 {
     dsam->bn_mod_exp = bn_mod_exp;