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NFC: digital: Ensure no DID in NFC-DEP responses
When in Initiator mode, the digital layer's NFC-DEP code always sets the Device ID (DID) value in the ATR_REQ to '0'. This means that subsequent DEP_REQ and DEP_RES frames must never include a DID byte. This is specified in sections 14.8.1.1 and 14.8.2.1 of the NFC Digital Protocol Spec. Currently, the digital layer's NFC-DEP code doesn't enforce this rule so add code to ensure that there is no DID byte in DEP_RES frames. Reviewed-by: Thierry Escande <thierry.escande@linux.intel.com> Tested-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Mark A. Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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@ -411,8 +411,11 @@ static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
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pfb = dep_res->pfb;
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if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb))
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size++;
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if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {
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PROTOCOL_ERR("14.8.2.1");
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rc = -EIO;
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goto error;
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}
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if (size > resp->len) {
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rc = -EIO;
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