ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size()

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size() The step variable is initialized to zero. It is changed in the loop, but if it's not changed it will remain zero. Add a variable check before the division. The observed behavior was introduced by commit 826b5de90c0b ("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size"), and it is difficult to show that any of the interval parameters will satisfy the snd_interval_test() condition with data from the amdtp_rate_table[] table. Found by Linux Verification Center (linuxtesting.org) with SVACE.

Timeline

1. Nov 8, 2024, 6:07 AM UTCCVE published
2. Oct 1, 2025, 8:17 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 15, 2026, 12:57 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in d575414361630b8b0523912532fcd7c79e43468c; From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in 5e431f85c87bbffd93a9830d5a576586f9855291; From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in 7d4eb9e22131ec154e638cbd56629195c9bcbe9a; From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in d2826873db70a6719cdd9212a6739f3e6234cfc4; From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in 4bdc21506f12b2d432b1f2667e5ff4c75eee58e3; From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in 3452d39c4704aa12504e4190298c721fb01083c3; From 826b5de90c0bca4e9de6231da9e1730480621588 · fixed in 72cafe63b35d06b5cfbaf807e90ae657907858da

• Linux Linux

  4.20

• KernelLinux

  From 4.20.0 · fixed in 5.4.285; From 5.5.0 · fixed in 5.10.229; From 5.11.0 · fixed in 5.15.170; From 5.16.0 · fixed in 6.1.115; From 6.2.0 · fixed in 6.6.59; From 6.7.0 · fixed in 6.11.6

References 7