Check rng return value when generating Transaction IDs in DHCP plugin

diff --git a/src/libcharon/plugins/dhcp/dhcp_socket.c b/src/libcharon/plugins/dhcp/dhcp_socket.c
index b4e9af7..8f976ae 100644 (file)
--- a/src/libcharon/plugins/dhcp/dhcp_socket.c
+++ b/src/libcharon/plugins/dhcp/dhcp_socket.c
@@ -366,7 +366,11 @@ METHOD(dhcp_socket_t, enroll, dhcp_transaction_t*,
        u_int32_t id;
        int try;
 
-       this->rng->get_bytes(this->rng, sizeof(id), (u_int8_t*)&id);
+       if (!this->rng->get_bytes(this->rng, sizeof(id), (u_int8_t*)&id))
+       {
+               DBG1(DBG_CFG, "DHCP DISCOVER failed, no transaction ID");
+               return NULL;
+       }
        transaction = dhcp_transaction_create(id, identity);
 
        this->mutex->lock(this->mutex);