Linux ACPI: Validate return type of _STR method in sysfs

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Title: ACPI: sysfs: validate return type of _STR method - Description: In sysfs, it is necessary to validate the return type of the _STR method. Only buffer objects are valid return values. 2. Fix Measures: - Code Changes: In the file , validation of the return type for the _STR method was added. - Changes Made: - In the original code, if the _STR method existed, was used as the second parameter. - In the modified code, if the _STR method exists, a buffer object is used as the second parameter. 3. Reason for Fix: - Problem Description: If the return value of the _STR method is not a buffer object, the function may access invalid memory. - Fix Objective: Ensure that the return value of the _STR method is a valid buffer object. 4. Related Patch and Authors: - Patch Link: https://patch-msgid.link/20240709-acpi-sysfs-groups-v2-1-058ab0667fa8@weissschuh.net - Authors: - Thomas Weißschuh - Greg Kroah-Hartman 5. Patch Status: - Status: Merged into upstream. - Date: July 9, 2024. With this information, we can understand the vulnerability's fix process, the specific measures taken, the underlying reason for the fix, and the contributors involved.

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Linux ACPI: Validate return type of _STR method in sysfs