[Sound-open-firmware] out-of-bounds access in sound/soc/sof/topology.c

[Curtis Malainey]

> Now control data allocations looks as follows
>
>         scontrol->size = struct_size(scontrol->control_data, chanv,
>                                      le32_to_cpu(mc->num_channels));
>         scontrol->control_data = kzalloc(scontrol->size, GFP_KERNEL);
>
> Which is sizeof(sof_ipc_ctrl_data) + mc->num_channels * sizeof(sof_ipc_ctrl_value_chan)
>
> For some reason it uses sizeof(sof_ipc_ctrl_value_chan), which is not
> the largest member of the union.
>

For the record, this could be hitting as far back as 5.4 as I have
been trying to debug an invalid IPC write in JSL.