Vulnerability CVE-2024-46859
Published: 2024-09-27

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

platform/x86: panasonic-laptop: Fix SINF array out of bounds accesses

The panasonic laptop code in various places uses the SINF array with index
values of 0 - SINF_CUR_BRIGHT(0x0d) without checking that the SINF array
is big enough.

Not all panasonic laptops have this many SINF array entries, for example
the Toughbook CF-18 model only has 10 SINF array entries. So it only
supports the AC+DC brightness entries and mute.

Check that the SINF array has a minimum size which covers all AC+DC
brightness entries and refuse to load if the SINF array is smaller.

For higher SINF indexes hide the sysfs attributes when the SINF array
does not contain an entry for that attribute, avoiding show()/store()
accessing the array out of bounds and add bounds checking to the probe()
and resume() code accessing these.

 References:
https://git.kernel.org/stable/c/9291fadbd2720a869b1d2fcf82305648e2e62a16
https://git.kernel.org/stable/c/6821a82616f60aa72c5909b3e252ad97fb9f7e2a
https://git.kernel.org/stable/c/b38c19783286a71693c2194ed1b36665168c09c4
https://git.kernel.org/stable/c/f52e98d16e9bd7dd2b3aef8e38db5cbc9899d6a4
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