CVE-2024-53055wifi: iwlwifi: mvm: fix 6 GHz scan construction

Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mvm: fix 6 GHz scan construction If more than 255 colocated APs exist for the set of all APs found during 2.4/5 GHz scanning, then the 6 GHz scan construction will loop forever since the loop variable has type u8, which can never reach the number found when that's bigger than 255, and is stored in a u32 variable. Also move it into the loops to have a smaller scope. Using a u32 there is fine, we limit the number of APs in the scan list and each has a limit on the number of RNR entries due to the frame size. With a limit of 1000 scan results, a frame size upper bound of 4096 (really it's more like ~2300) and a TBTT entry size of at least 11, we get an upper bound for the number of ~372k, well in the bounds of a u32.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/2ac15e5a8f42fed5d90ed9e1197600913678c50f
• https://git.kernel.org/stable/c/cde8a7eb5c6762264ff0f4433358e0a0d250c875
• https://git.kernel.org/stable/c/fc621e7a043de346c33bd7ae7e2e0c651d6152ef
• https://git.kernel.org/stable/c/2ccd5badadab2d586e91546bf5af3deda07fef1f
• https://git.kernel.org/stable/c/7245012f0f496162dd95d888ed2ceb5a35170f1a
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html