Vulnerability CVE-2024-38635
Published: 2024-06-21

Description:
In the Linux kernel, the following vulnerability has been resolved:

soundwire: cadence: fix invalid PDI offset

For some reason, we add an offset to the PDI, presumably to skip the
PDI0 and PDI1 which are reserved for BPT.

This code is however completely wrong and leads to an out-of-bounds
access. We were just lucky so far since we used only a couple of PDIs
and remained within the PDI array bounds.

A Fixes: tag is not provided since there are no known platforms where
the out-of-bounds would be accessed, and the initial code had problems
as well.

A follow-up patch completely removes this useless offset.

 References:
https://git.kernel.org/stable/c/002364b2d594a9afc0385c09e00994c510b1d089
https://git.kernel.org/stable/c/fd4bcb991ebaf0d1813d81d9983cfa99f9ef5328
https://git.kernel.org/stable/c/902f6d656441a511ac25c6cffce74496db10a078
https://git.kernel.org/stable/c/2ebcaa0e5db9b6044bb487ae1cf41bc601761567
https://git.kernel.org/stable/c/7eeef1e935d23db5265233d92395bd5c648a4021
https://git.kernel.org/stable/c/4e99103f757cdf636c6ee860994a19a346a11785
https://git.kernel.org/stable/c/8ee1b439b1540ae543149b15a2a61b9dff937d91
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