ACPI: APEI: GHES: Validate CXL protocol error section length before RAS cap copy

cxl_cper_setup_prot_err_work_data() locates the RAS Capability block at
prot_err + sizeof(*prot_err) + dvsec_len and copies it, but dvsec_len is
firmware controlled and never validated, so it can point the copy outside
the section.

Extend cxl_cper_sec_prot_err_valid() to check that the section can hold
the header, and that the header, DVSEC and RAS Capability block together
fit the reported section length.

Reported-by: sashiko-bot@kernel.org
Link: https://sashiko.dev/#/patchset/20260617-topics-ahmtib01-ras_ffh_arm_internal_review-v6-0-91f725174aa0@arm.com?part=6
Link: https://lore.kernel.org/linux-cxl/20260709165457.8BA181F000E9@smtp.kernel.org/
Fixes: 315c2f0b53ba ("acpi/ghes, cper: Recognize and cache CXL Protocol errors")
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260904172337.1409775-10-dave.jiang@intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

0 files changed, 0 insertions, 0 deletions