wifi: wfx: validate MIB read length before copying to caller

Overview

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

wifi: wfx: validate MIB read length before copying to caller

wfx_hif_read_mib() copies reply->length bytes from the firmware response into the caller-provided buffer without checking that reply->length does not exceed val_len. A firmware response with a length field larger than expected overruns the caller buffer and reads past the end of the reply allocation.

Replace the dead -ENOMEM check with an active validation that reply->length fits within val_len before the memcpy.

Affected

• Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 02886c18a340da59df57365f29009e1258bfe333
• Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 71d140099165de03128c00dd129f1eab21c6a3c4
• Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 7acb36fd60a3e7b858f12e69a919c3609b281408
• Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < ce67ebe9d8629776ce38e6995ae72fb903c828db
• Linux 5.5

Remediation

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