CVE-2024-58068

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

OPP: fix dev_pm_opp_find_bw_*() when bandwidth table not initialized

If a driver calls dev_pm_opp_find_bw_ceil/floor() the retrieve bandwidth

from the OPP table but the bandwidth table was not created because the

interconnect properties were missing in the OPP consumer node, the

kernel will crash with:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004

...

pc : _read_bw+0x8/0x10

lr : _opp_table_find_key+0x9c/0x174

...

Call trace:

_read_bw+0x8/0x10 (P)

_opp_table_find_key+0x9c/0x174 (L)

_find_key+0x98/0x168

dev_pm_opp_find_bw_ceil+0x50/0x88

...

In order to fix the crash, create an assert function to check

if the bandwidth table was created before trying to get a

bandwidth with _read_bw().