aboutsummaryrefslogtreecommitdiff
path: root/net/nfc
diff options
context:
space:
mode:
authorSamuel Ortiz <sameo@linux.intel.com>2012-11-01 23:36:07 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2012-11-19 23:57:01 +0100
commitbe02b6b624005d47c388f799ce23714136430217 (patch)
tree2e440fa1279d91f0791e3ee3248c2120bc4855aa /net/nfc
parentdd2bf43ffcf0d1bba94d20abc6cc44ed294db66b (diff)
downloadlinux-be02b6b624005d47c388f799ce23714136430217.tar.gz
NFC: Queue a copy of the transmitted LLCP skb
Drivers are allowed to modify the sent skb and thus we need to make a copy of it before passing it to the driver. Without this fix, LLCP Tx skbs were not queued properly as the ptype check was failing due to e.g. the pn533 driver skb_pushing the Tx skb. Reported-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/llcp/llcp.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index f6804532047..66733335345 100644
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -656,6 +656,8 @@ static void nfc_llcp_tx_work(struct work_struct *work)
if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
nfc_llcp_send_symm(local->dev);
} else {
+ struct sk_buff *copy_skb = NULL;
+ u8 ptype = nfc_llcp_ptype(skb);
int ret;
pr_debug("Sending pending skb\n");
@@ -663,22 +665,29 @@ static void nfc_llcp_tx_work(struct work_struct *work)
DUMP_PREFIX_OFFSET, 16, 1,
skb->data, skb->len, true);
+ if (ptype == LLCP_PDU_I)
+ copy_skb = skb_copy(skb, GFP_ATOMIC);
+
nfc_llcp_send_to_raw_sock(local, skb,
NFC_LLCP_DIRECTION_TX);
ret = nfc_data_exchange(local->dev, local->target_idx,
skb, nfc_llcp_recv, local);
- if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
- skb = skb_get(skb);
- skb_queue_tail(&llcp_sock->tx_pending_queue,
- skb);
+ if (ret) {
+ kfree_skb(copy_skb);
+ goto out;
}
+
+ if (ptype == LLCP_PDU_I && copy_skb)
+ skb_queue_tail(&llcp_sock->tx_pending_queue,
+ copy_skb);
}
} else {
nfc_llcp_send_symm(local->dev);
}
+out:
mod_timer(&local->link_timer,
jiffies + msecs_to_jiffies(2 * local->remote_lto));
}