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authorChristophe Ricard <christophe.ricard@gmail.com>2015-10-25 22:54:20 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2015-10-26 06:53:11 +0100
commit500c4ef02277eaadbfe20537f963b6221f6ac007 (patch)
treebc0675ce1c6f0f7e9ba8bd1e403ab871a4082dd9 /net/nfc
parenta1269dd116319335db6d73013a31c038486c813e (diff)
NFC: nci: Fix incorrect data chaining when sending data
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>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/nci/hci.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index 609f92283d1b..321889ee2107 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -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);