CVE-2022-49529

/// Technical description

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

drm/amdgpu/pm: fix the null pointer while the smu is disabled

It needs to check if the pp_funcs is initialized while release the

context, otherwise it will trigger null pointer panic while the software

smu is not enabled.

[ 1109.404555] BUG: kernel NULL pointer dereference, address: 0000000000000078

[ 1109.404609] #PF: supervisor read access in kernel mode

[ 1109.404638] #PF: error_code(0x0000) - not-present page

[ 1109.404657] PGD 0 P4D 0

[ 1109.404672] Oops: 0000 [#1] PREEMPT SMP NOPTI

[ 1109.404701] CPU: 7 PID: 9150 Comm: amdgpu_test Tainted: G OEL 5.16.0-custom #1

[ 1109.404732] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006

[ 1109.404765] RIP: 0010:amdgpu_dpm_force_performance_level+0x1d/0x170 [amdgpu]

[ 1109.405109] Code: 5d c3 44 8b a3 f0 80 00 00 eb e5 66 90 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 4c 8b b7 f0 7d 00 00 <49> 83 7e 78 00 0f 8

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References