What happened
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix potential NULL dereference in mtk_crtc_destroy() In mtk_crtc_create(), if the call to mbox_request_channel() fails then we set the "mtk_crtc->cmdq_client.chan" pointer to NULL. In that situation, we do not call cmdq_pkt_create(). During the cleanup, we need to check if the "mtk_crtc->cmdq_client.chan" is NULL first before calling cmdq_pkt_destroy(). Calling cmdq_pkt_destroy() is unnecessary if we didn't call cmdq_pkt_create() and it will result in a NULL pointer dereference.
Affected versions
Linux: 7627122fd1c06800a1fe624e9fb3c269796115e8 through before fb05e973698f4af008c7fb6e0cfa6a2fa1d98409 (git); 7627122fd1c06800a1fe624e9fb3c269796115e8 through before c60583a87cb4a85b69d1f448f0be5eb6ec62cbb2 (git); 7627122fd1c06800a1fe624e9fb3c269796115e8 through before 4018651ba5c409034149f297d3dd3328b91561fd (git); 2c4396693698e876e559768d3d3a150c672ec384 (git); 5.15.54 through before 5.16 (semver); 5.17 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.