CVE-2025-21870

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers<br /> <br /> Other, non DAI copier widgets could have the same stream name (sname) as<br /> the ALH copier and in that case the copier-&gt;data is NULL, no alh_data is<br /> attached, which could lead to NULL pointer dereference.<br /> We could check for this NULL pointer in sof_ipc4_prepare_copier_module()<br /> and avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai()<br /> will miscalculate the ALH device count, causing broken audio.<br /> <br /> The correct fix is to harden the matching logic by making sure that the<br /> 1. widget is a DAI widget - so dai = w-&gt;private is valid<br /> 2. the dai (and thus the copier) is ALH copier