HID: cougar: fix slab-out-of-bounds Read in cougar_report_fixup

CVE-2024-46747

What is CVE-2024-46747?

A vulnerability has been identified in the Linux kernel involving the Cougar 500k Gaming Keyboard, where the 'report_fixup' function failed to properly validate the size of report descriptors before accessing them. This oversight can lead to a slab-out-of-bounds read, potentially exposing sensitive data and impacting system integrity. Users of the affected keyboards are advised to apply the latest updates from the vendor to mitigate the risks associated with this vulnerability.

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