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      <title>CVE-2025-21870 — ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2025-21870</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers&lt;/p&gt;
&lt;p&gt;Other, non DAI copier widgets could have the same  stream name (sname) as
the ALH copier and in that case the copier-&amp;gt;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.&lt;/p&gt;
&lt;p&gt;The correct fix is to harden the matching logic by making sure that the
1. widget is a DAI widget - so dai = w-&amp;gt;private is valid
2. the dai (and thus the copier) is ALH copier&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Linux&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers&lt;/p&gt;
&lt;p&gt;Other, non DAI copier widgets could have the same  stream name (sname) as
the ALH copier and in that case the copier-&amp;gt;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.&lt;/p&gt;
&lt;p&gt;The correct fix is to harden the matching logic by making sure that the
1. widget is a DAI widget - so dai = w-&amp;gt;private is valid
2. the dai (and thus the copier) is ALH copier&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2025-21870</guid>
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