Add return value to dh_generate_y().

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@499 7dcaeef0-15fb-0310-b436-a5af3365683c

include/libssh/priv.h

@@ -517,7 +517,7 @@ void ssh_set_error(void *error, int code, const char *descr, ...) PRINTF_ATTRIBU
 void dh_generate_e(SSH_SESSION *session);
 void ssh_print_bignum(const char *which,bignum num);
 int dh_generate_x(SSH_SESSION *session);
-void dh_generate_y(SSH_SESSION *session);
+int dh_generate_y(SSH_SESSION *session);
 void dh_generate_f(SSH_SESSION *session);
 
 int ssh_crypto_init(void);

libssh/dh.c

@@ -234,18 +234,26 @@ int dh_generate_x(SSH_SESSION *session) {
 }
 
 /* used by server */
-void dh_generate_y(SSH_SESSION *session){
+int dh_generate_y(SSH_SESSION *session) {
     session->next_crypto->y = bignum_new();
+  if (session->next_crypto->y == NULL) {
+    return -1;
+  }
+
 #ifdef HAVE_LIBGCRYPT
   bignum_rand(session->next_crypto->y, 128);
 #elif defined HAVE_LIBCRYPTO
   bignum_rand(session->next_crypto->y, 128, 0, -1);
 #endif
+
   /* not harder than this */
 #ifdef DEBUG_CRYPTO
   ssh_print_bignum("y", session->next_crypto->y);
 #endif
+
+  return 0;
 }
+
 /* used by server */
 void dh_generate_e(SSH_SESSION *session){
 #ifdef HAVE_LIBCRYPTO

libssh/server.c

@@ -274,7 +274,10 @@ static int dh_handshake_server(SSH_SESSION *session){
     }
     dh_import_e(session,e);
     free(e);
-    dh_generate_y(session);
+    if (dh_generate_y(session) < 0) {
+      ssh_set_error(session,SSH_FATAL,"Could not create y number");
+      return -1;
+    }
     dh_generate_f(session);
     f=dh_get_f(session);
     switch(session->hostkeys){