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

Overview

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

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

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.

Affected

• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 0d482995f0cdd0302450aa300c684c642d8ab31f
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 9e8df087826b9999d1b83b06f5d85675d5a69c9e
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < db66a30588630c7de30ef033f00daddef69f6ad9
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 144ad477c381e2c592b64898d04ab4ce03b32861
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < e4da1452e10c6472a4bac48dc2f6a35fff1fcd69
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 14b1467cfc6630583650f33538174c5a1ec685ab
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 035056e07ea65be670284246d9bc62f2f00ff4a3
• Linux >= 562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06 < 092c6a605cbd6414ef499834c2e0da69c2c3388e
• Linux 3.13

Remediation

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