HID: sensor: custom: Fix use-after-free in enable_sensor

Overview

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

HID: sensor: custom: Fix use-after-free in enable_sensor

enable_sensor_store() can call set_power_report_state(), which dereferences sensor_inst->power_state and sensor_inst->report_state. These pointers refer to entries in sensor_inst->fields.

Create the field attributes before exposing the enable_sensor sysfs attribute, so enable_sensor cannot be accessed before the state it depends on has been initialized.

On remove, delete enable_sensor before freeing the field attributes, so a concurrent sysfs write cannot dereference freed memory through power_state or report_state.

Affected

• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < c2be74b0272b7f8f60739e7aaf0d36c0befe7136
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < d7cbea1d342a16ec96d9eb3d7bd0ba2d4b2f2855
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < d37ff4e3635c18af907f25712596f8ccec323751
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < 2ce90cfc6646a32100feabd7110ae0352aa01167
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < 244a1cb638370490ed74a8adb5cc3f1212602e32
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < 8406d4b69d48bc72fb6f8812a65a17a1f903440b
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < c0757f10610542d763bd0bf9bda455b78afeef0b
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < 7bb79a3cf45e0805aef74457e19deb77e18cf196
• Linux >= 4a7de0519df5e8fb89cef6ee062330ffe4b50a4d < ad8fb82b04422f49530d2aa2753cc81d1c60102c
• Linux 4.1

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.