CVE-2024-41039 Information

Description

In the Linux kernel the following vulnerability has been resolved:

firmware: cs_dsp: Fix overflow checking of wmfw header

Fix the checking that firmware file buffer is large enough for the wmfw header to prevent overrunning the buffer.

The original code tested that the firmware data buffer contained enough bytes for the sums of the size of the structs

wmfw_header + wmfw_adsp1_sizes + wmfw_footer

But wmfw_adsp1_sizes is only used on ADSP1 firmware. For ADSP2 and Halo Core the equivalent struct is wmfw_adsp2_sizes which is 4 bytes longer. So the length check didn’t guarantee that there are enough bytes in the firmware buffer for a header with wmfw_adsp2_sizes.

This patch splits the length check into three separate parts. Each of the wmfw_header wmfw_adsp?_sizes and wmfw_footer are checked separately before they are used.

Reference

https://git.kernel.org/stable/c/fd035f0810b33c2a8792effdb82bf35920221565 https://git.kernel.org/stable/c/9c9877a96e033bf6c6470b3b4f06106d91ace11e https://git.kernel.org/stable/c/49a79f344d0a17c6a5eef53716cc76fcdbfca9ba https://git.kernel.org/stable/c/3019b86bce16fbb5bc1964f3544d0ce7d0137278