Check for num cpus

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/libringbuffer/ring_buffer_frontend.c b/libringbuffer/ring_buffer_frontend.c
index 5e6d4df267d2c48d9d4c0bfa44b33202574dcea0..0b4b89f7306fee1b77bf4e9b44c9ec48e47af643 100644 (file)
--- a/libringbuffer/ring_buffer_frontend.c
+++ b/libringbuffer/ring_buffer_frontend.c
@@ -643,6 +643,8 @@ struct lib_ring_buffer *channel_get_ring_buffer(
                        memory_map_size);
                return shmp(handle, chan->backend.buf[0].shmp);
        } else {
+               if (cpu >= num_possible_cpus())
+                       return NULL;
                ref = &chan->backend.buf[cpu].shmp._ref;
                shm_get_object_data(handle, ref, shm_fd, wait_fd,
                        memory_map_size);