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 alhdata is attached, which could lead to NULL pointer dereference. We could check for this NULL pointer in sofipc4preparecopiermodule() and avoid the crash, but a similar loop in sofipc4widgetsetupcompdai() 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