Bluetooth: Linearize skbs for use in BNEP, CMTP, HIDP, and RFCOMM

Fragmented skbs are only encountered when receiving ERTM or streaming
mode L2CAP data.  BNEP, CMTP, HIDP, and RFCOMM generally use basic
mode, but they need to handle fragments without crashing.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

4 files changed, 20 insertions, 5 deletions

diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index d9edfe8bf9d6..91bcd3a961ec 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -492,7 +492,10 @@ static int bnep_session(void *arg)
                 /* RX */
                 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
                         skb_orphan(skb);
-                        bnep_rx_frame(s, skb);
+                        if (!skb_linearize(skb))
+                                bnep_rx_frame(s, skb);
+                        else
+                                kfree_skb(skb);
                 }
 
                 if (sk->sk_state != BT_CONNECTED)
diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
index 521baa4fe835..7d00ddf9e9dc 100644
--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -302,7 +302,10 @@ static int cmtp_session(void *arg)
 
                 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
                         skb_orphan(skb);
-                        cmtp_recv_frame(session, skb);
+                        if (!skb_linearize(skb))
+                                cmtp_recv_frame(session, skb);
+                        else
+                                kfree_skb(skb);
                 }
 
                 cmtp_process_transmit(session);
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index b83979c548b2..075a3e920caf 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -716,12 +716,18 @@ static int hidp_session(void *arg)
 
                 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
                         skb_orphan(skb);
-                        hidp_recv_ctrl_frame(session, skb);
+                        if (!skb_linearize(skb))
+                                hidp_recv_ctrl_frame(session, skb);
+                        else
+                                kfree_skb(skb);
                 }
 
                 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
                         skb_orphan(skb);
-                        hidp_recv_intr_frame(session, skb);
+                        if (!skb_linearize(skb))
+                                hidp_recv_intr_frame(session, skb);
+                        else
+                                kfree_skb(skb);
                 }
 
                 hidp_process_transmit(session);
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index 5ba3f6df665c..38b618c96de6 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -1853,7 +1853,10 @@ static inline void rfcomm_process_rx(struct rfcomm_session *s)
         /* Get data directly from socket receive queue without copying it. */
         while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
                 skb_orphan(skb);
-                rfcomm_recv_frame(s, skb);
+                if (!skb_linearize(skb))
+                        rfcomm_recv_frame(s, skb);
+                else
+                        kfree_skb(skb);
         }
 
         if (sk->sk_state == BT_CLOSED) {