Description
In the Linux kernel, the following vulnerability has been resolved: drm/i915/mst: limit DP MST ESI service loop The loop in intel_dp_check_mst_status() keeps servicing interrupts originating from the sink without bound. Add an upper bound to the new interrupts occurring during interrupt processing to not get stuck on potentially stuck sink devices. Use arbitrary 32 tries to clear incoming interrupts in one go. Discovered using AI-assisted static analysis confirmed by Intel Product Security. Note: The condition likely pre-dates the commit in the Fixes: tag, but this is about as far back as a backport has any chance of succeeding. Before that, the retry had a goto. (cherry picked from commit b4ea5272133059acb493cc36599071a9e852ec2e)
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
3c0ec2c2d5948356a22c8f1c08a8087b12a303e7 to < fae63319ad397666a9c56a17ea1047d2bf9a1e25affected3c0ec2c2d5948356a22c8f1c08a8087b12a303e7 to < 02ceba559412751106c0cfa5cbdb80db50303083affected3c0ec2c2d5948356a22c8f1c08a8087b12a303e7 to < e3bcd3bf7eeca9570b9fa0b2f8a602c7bcc6b0d0affected3c0ec2c2d5948356a22c8f1c08a8087b12a303e7 to < 9061fbf2230b6fcef042a6f637beae57c2fc93a5affected3c0ec2c2d5948356a22c8f1c08a8087b12a303e7 to < 005771c18c5b2c98cb4e7517661aea460990fd3faffected
Linux Linux
Default version status: affected
5.8affected0 to < 5.8unaffected6.6.160 to ≤ 6.6.*unaffected6.12.114 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/fae63319ad397666a9c56a17ea1047d2bf9a1e25 ↗
- https://git.kernel.org/stable/c/02ceba559412751106c0cfa5cbdb80db50303083 ↗
- https://git.kernel.org/stable/c/e3bcd3bf7eeca9570b9fa0b2f8a602c7bcc6b0d0 ↗
- https://git.kernel.org/stable/c/9061fbf2230b6fcef042a6f637beae57c2fc93a5 ↗
- https://git.kernel.org/stable/c/005771c18c5b2c98cb4e7517661aea460990fd3f ↗