nfc: port100: reject frames whose declared length exceeds the received data

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port100_recv_response() passes the URB transfer buffer to
port100_rx_frame_is_valid(), which checksums le16_to_cpu(frame->datalen)
bytes of frame->data. datalen is a 16-bit field supplied by the device
and is never checked against the number of bytes actually received
(urb->actual_length), so a device reporting a datalen larger than the
received frame makes port100_data_checksum() read out of bounds past the
transfer buffer.

Reject a response whose declared frame size does not fit the received
length before validating it.

Found by 0sec (https://0sec.ai) using automated source analysis; the
missing bound is evident from source. Compile-tested.

Fixes: 562d4d59b8 ("NFC: Sony Port-100 Series driver")
Cc: stable@vger.kernel.org
Assisted-by: 0sec:claude-opus-4-8
Signed-off-by: Doruk Tan Ozturk <doruk@0sec.ai>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260711123651.32595-1-doruk@0sec.ai
Signed-off-by: David Heidelberg <david@ixit.cz>

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Doruk Tan Ozturk 2026-07-11 14:36:51 +02:00 • committed by David Heidelberg

parent bf1460acdf

commit 092c6a605c

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drivers/nfc/port100.c

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