complib/cl_dispatcher.c: Check registrations vector size when searching for handlers

From: Daniel Klein <danielk-VPRAkNaXOzVWk0Htik3J/[email protected]>

When cl_disp_post is called with message_id != CL_DISP_MSGID_NONE, it searches for the handler for the message in a vector using message_id as the index.

This change adds a check to verify that the message_id that is used as an index is not larger than vector's size.
This change adds resiliency to the code when cl_disp_post() is called with an invalid message_id.

---
 complib/cl_dispatcher.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

index 6736d67..1255c83 100644
@@ -302,6 +302,11 @@ cl_status_t cl_disp_post(IN const cl_disp_reg_handle_t handle,
 
 	cl_spinlock_acquire(&p_disp->lock);
 	/* Check that the recipient exists. */
+	if (cl_ptr_vector_get_size(&p_disp->reg_vec) <= msg_id) {
+		cl_spinlock_release(&p_disp->lock);
+		return (CL_NOT_FOUND);
+	}
+
 	p_dest_reg = cl_ptr_vector_get(&p_disp->reg_vec, msg_id);
 	if (!p_dest_reg) {
 		cl_spinlock_release(&p_disp->lock);

1.7.8.2

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