diff options
| author | Christophe Ricard <christophe.ricard@gmail.com> | 2015-03-31 09:02:22 +0300 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2015-04-06 01:19:22 +0300 |
| commit | 1dab57f0ed753ddef07a8aa987d490c74884ff18 (patch) | |
| tree | 9e64fd764e722139686ee8e69281c5de1509f52e /drivers/nfc | |
| parent | 1f74f323e2c30b7fd53f6ad16c1990f2c80bbfc0 (diff) | |
| download | linux-1dab57f0ed753ddef07a8aa987d490c74884ff18.tar.xz | |
nfc: st21nfcb: Add additional comments about EVT_TRANSACTION
Add comments about HCI EVT_TRANSACTION in order to make the code
understandable by other readers.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/st21nfcb/st21nfcb_se.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/nfc/st21nfcb/st21nfcb_se.c b/drivers/nfc/st21nfcb/st21nfcb_se.c index 6df7b950d0e9..24862a525fb5 100644 --- a/drivers/nfc/st21nfcb/st21nfcb_se.c +++ b/drivers/nfc/st21nfcb/st21nfcb_se.c @@ -321,6 +321,12 @@ static int st21nfcb_hci_connectivity_event_received(struct nci_dev *ndev, break; case ST21NFCB_EVT_TRANSACTION: + /* According to specification etsi 102 622 + * 11.2.2.4 EVT_TRANSACTION Table 52 + * Description Tag Length + * AID 81 5 to 16 + * PARAMETERS 82 0 to 255 + */ if (skb->len < NFC_MIN_AID_LENGTH + 2 && skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG) return -EPROTO; @@ -329,8 +335,9 @@ static int st21nfcb_hci_connectivity_event_received(struct nci_dev *ndev, skb->len - 2, GFP_KERNEL); transaction->aid_len = skb->data[1]; - memcpy(transaction->aid, &skb->data[2], skb->data[1]); + memcpy(transaction->aid, &skb->data[2], transaction->aid_len); + /* Check next byte is PARAMETERS tag (82) */ if (skb->data[transaction->aid_len + 2] != NFC_EVT_TRANSACTION_PARAMS_TAG) return -EPROTO; |