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NFC: nci: Fix incorrect data chaining when sending data

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When sending HCI data over NCI, cmd information should be
present only on the first packet.
Each packet shall be specifically allocated and sent to the
NCI layer.

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Christophe Ricard 2015-10-25 22:54:20 +01:00 committed by Samuel Ortiz
parent a1269dd116
commit 500c4ef022
1 changed files with 13 additions and 7 deletions
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20
net/nfc/nci/hci.c
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@ -146,18 +146,18 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
if (!conn_info)
return -EPROTO;
skb = nci_skb_alloc(ndev, 2 + conn_info->max_pkt_payload_len +
i = 0;
skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
NCI_DATA_HDR_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, 2 + NCI_DATA_HDR_SIZE);
skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
*skb_push(skb, 1) = data_type;
i = 0;
len = conn_info->max_pkt_payload_len;
do {
len = conn_info->max_pkt_payload_len;
/* If last packet add NCI_HFP_NO_CHAINING */
if (i + conn_info->max_pkt_payload_len -
(skb->len + 1) >= data_len) {
@ -177,9 +177,15 @@ static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
return r;
i += len;
if (i < data_len) {
skb_trim(skb, 0);
skb_pull(skb, len);
skb = nci_skb_alloc(ndev,
conn_info->max_pkt_payload_len +
NCI_DATA_HDR_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
}
} while (i < data_len);