Description
In the Linux kernel, the following vulnerability has been resolved: drm/ast: Fix soft lockup There is a while-loop in ast_dp_set_on_off() that could lead to infinite-loop. This is because the register, VGACRI-Dx, checked in this API is a scratch register actually controlled by a MCU, named DPMCU, in BMC. These scratch registers are protected by scu-lock. If suc-lock is not off, DPMCU can not update these registers and then host will have soft lockup due to never updated status. DPMCU is used to control DP and relative registers to handshake with host's VGA driver. Even the most time-consuming task, DP's link training, is less than 100ms. 200ms should be enough.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 to < 8a6fea3fcb577a543ef67683ca7105bde49a38fbaffected594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 to < a81b2acd43e24e419f65df97348c76a5a1496066affected594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 to < 35768baf0fdfc47ede42d899506bad78450e9294affected594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 to < bc004f5038220b1891ef4107134ccae44be55109affected
Linux Linux
Default version status: affected
5.19affected0 to < 5.19unaffected6.1.87 to ≤ 6.1.*unaffected6.6.28 to ≤ 6.6.*unaffected6.8.7 to ≤ 6.8.*unaffected6.9 to ≤ *unaffected