CVE-2025-21870

In the Linux kernel, the following vulnerability has been resolved:

ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers

Other, non DAI copier widgets could have the same stream name (sname) as

the ALH copier and in that case the copier->data is NULL, no alh_data is

attached, which could lead to NULL pointer dereference.

We could check for this NULL pointer in sof_ipc4_prepare_copier_module()

and avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai()

will miscalculate the ALH device count, causing broken audio.

The correct fix is to harden the matching logic by making sure that the

1. widget is a DAI widget - so dai = w->private is valid

2. the dai (and thus the copier) is ALH copier