netdev - [REGRESSION] NFC broken on Thinkpad T14 Gen since 9c328f5

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Message-ID: <11b7567e-b9a4-4546-9b1c-bb9820bead0c@0x83.eu>
Date: Fri, 6 Feb 2026 16:15:34 +0100
From: "Lukas K." <kernel@...3.eu>
To: linux-kernel@...r.kernel.org, krzk@...nel.org
Cc: regressions@...ts.linux.dev, netdev@...r.kernel.org
Subject: [REGRESSION] NFC broken on Thinkpad T14 Gen since 9c328f5

Hi All,

from 6.17.2 to 6.17.3, the integrated NFC reader (driver: nxp-nci_i2c) 
in the Thinkpad T14 Gen 4 (AMD) stopped detecting tags. This can be 
tested by running

sudo nfctool -1 -p -d nfc0

Looking at the commits between 6.17.2 and 6.17.3, 9c328f5 (net: nfc: 
nci: Add parameter validation for packet data) was the only one related 
to NFC.

To see if that commit indeed was the culprit, I reverted it on 6.18.7 
and nfctool is detecting tags again.

Since the offending commit merely adds some bounds checks, the root 
cause may very well be in another driver in the NFC stack.

Best Regards,

Lukas