CVE-2025-39809

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

HID: intel-thc-hid: intel-quicki2c: Fix ACPI dsd ICRS/ISUB length

The QuickI2C ACPI _DSD methods return ICRS and ISUB data with a

trailing byte, making the actual length is one more byte than the

structs defined.

It caused stack-out-of-bounds and kernel crash:

kernel: BUG: KASAN: stack-out-of-bounds in quicki2c_acpi_get_dsd_property.constprop.0+0x111/0x1b0 [intel_quicki2c]

kernel: Write of size 12 at addr ffff888106d1f900 by task kworker/u33:2/75

kernel:

kernel: CPU: 3 UID: 0 PID: 75 Comm: kworker/u33:2 Not tainted 6.16.0+ #3 PREEMPT(voluntary)

kernel: Workqueue: async async_run_entry_fn

kernel: Call Trace:

kernel: <TASK>

kernel: dump_stack_lvl+0x76/0xa0

kernel: print_report+0xd1/0x660

kernel: ? __pfx__raw_spin_lock_irqsave+0x10/0x10

kernel: ? __kasan_slab_free+0x5d/0x80

kernel: ? kasan_addr_to_slab+0xd/0xb0

kernel: kasan_report+0xe1/0x120

kernel: ? quicki2c_acpi_get_dsd_property.constprop.0+0x111/0x1b0 [intel_quicki2c]

kernel: ? quicki2c_acpi_get_dsd_property.constprop.0+0x111/0x1b0 [intel_quicki2c]

kernel: kasan_check_range+0x11c/0x200

kernel: __asan_memcpy+0x3b/0x80

kernel: quicki2c_acpi_get_dsd_property.constprop.0+0x111/0x1b0 [intel_quicki2c]

kernel: ? __pfx_quicki2c_acpi_get_dsd_property.constprop.0+0x10/0x10 [intel_quicki2c]

kernel: quicki2c_get_acpi_resources+0x237/0x730 [intel_quicki2c]

[...]

kernel: </TASK>

kernel:

kernel: The buggy address belongs to stack of task kworker/u33:2/75

kernel: and is located at offset 48 in frame:

kernel: quicki2c_get_acpi_resources+0x0/0x730 [intel_quicki2c]

kernel:

kernel: This frame has 3 objects:

kernel: [32, 36) 'hid_desc_addr'

kernel: [48, 59) 'i2c_param'

kernel: [80, 224) 'i2c_config'

ACPI DSD methods return:

\_SB.PC00.THC0.ICRS Buffer 000000003fdc947b 001 Len 0C = 0A 00 80 1A 06 00 00 00 00 00 00 00

\_SB.PC00.THC0.ISUB Buffer 00000000f2fcbdc4 001 Len 91 = 00 00 00 00 00 00 00 00 00 00 00 00

Adding reserved padding to quicki2c_subip_acpi_parameter/config.