NFC: llcp: Terminate connection when receiving a DISC on (0,0)

According to the LLCP specs, we must terminate the LLCP link when receiving
a DISC with both ssap and dsap set to 0.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/net/nfc/llcp/llcp.c b/net/nfc/llcp/llcp.c
index 3a161c87ef7814fcbaaebe08f3d53e84a7adaf9f..9e483c8e52f8d81d2319ef0e1832c88b9a38928c 100644 (file)
--- a/net/nfc/llcp/llcp.c
+++ b/net/nfc/llcp/llcp.c
@@ -1106,6 +1106,12 @@ static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
        dsap = nfc_llcp_dsap(skb);
        ssap = nfc_llcp_ssap(skb);
 
+       if ((dsap == 0) && (ssap == 0)) {
+               pr_debug("Connection termination");
+               nfc_dep_link_down(local->dev);
+               return;
+       }
+
        llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
        if (llcp_sock == NULL) {
                nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);