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

Vulnerability Description

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

References

• https://git.kernel.org/stable/c/87c8768a96092ce75cd47fe076db5080db7ac515
• https://git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152
• https://git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef