Add return value to dh_generate_x().

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@498 7dcaeef0-15fb-0310-b436-a5af3365683c

include/libssh/priv.h

@@ -516,7 +516,7 @@ void ssh_set_error(void *error, int code, const char *descr, ...) PRINTF_ATTRIBU
 /* DH key generation */
 void dh_generate_e(SSH_SESSION *session);
 void ssh_print_bignum(const char *which,bignum num);
-void dh_generate_x(SSH_SESSION *session);
+int dh_generate_x(SSH_SESSION *session);
 void dh_generate_y(SSH_SESSION *session);
 void dh_generate_f(SSH_SESSION *session);
 

libssh/client.c

@@ -201,7 +201,9 @@ static int dh_handshake(SSH_SESSION *session) {
         goto error;
       }
 
-      dh_generate_x(session);
+      if (dh_generate_x(session) < 0) {
+        goto error;
+      }
       dh_generate_e(session);
 
       e = dh_get_e(session);

libssh/dh.c

@@ -213,18 +213,26 @@ void ssh_print_hexa(const char *descr, const unsigned char *what, size_t len) {
     printf("%s: %s\n", descr, hexa);
 }
 
-void dh_generate_x(SSH_SESSION *session){
+int dh_generate_x(SSH_SESSION *session) {
   session->next_crypto->x = bignum_new();
+  if (session->next_crypto->x == NULL) {
+    return -1;
+  }
+
 #ifdef HAVE_LIBGCRYPT
   bignum_rand(session->next_crypto->x, 128);
 #elif defined HAVE_LIBCRYPTO
   bignum_rand(session->next_crypto->x, 128, 0, -1);
 #endif
+
   /* not harder than this */
 #ifdef DEBUG_CRYPTO
   ssh_print_bignum("x", session->next_crypto->x);
 #endif
+
+  return 0;
 }
+
 /* used by server */
 void dh_generate_y(SSH_SESSION *session){
     session->next_crypto->y=bignum_new();