1 files changed, 15 insertions, 2 deletions

diff --git a/net/caif/cffrml.c b/net/caif/cffrml.c
index 4f4f756c49ac..04204b202718 100644
--- a/net/caif/cffrml.c
+++ b/net/caif/cffrml.c
@@ -33,7 +33,6 @@ static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
 static u32 cffrml_rcv_error;
 static u32 cffrml_rcv_checsum_error;
 struct cflayer *cffrml_create(u16 phyid, bool use_fcs)
-
 {
         struct cffrml *this = kmalloc(sizeof(struct cffrml), GFP_ATOMIC);
         if (!this) {
@@ -128,6 +127,13 @@ static int cffrml_receive(struct cflayer *layr, struct cfpkt *pkt)
                 cfpkt_destroy(pkt);
                 return -EPROTO;
         }
+
+        if (layr->up == NULL) {
+                pr_err("Layr up is missing!\n");
+                cfpkt_destroy(pkt);
+                return -EINVAL;
+        }
+
         return layr->up->receive(layr->up, pkt);
 }
 
@@ -150,15 +156,22 @@ static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt)
         cfpkt_info(pkt)->hdr_len += 2;
         if (cfpkt_erroneous(pkt)) {
                 pr_err("Packet is erroneous!\n");
+                cfpkt_destroy(pkt);
                 return -EPROTO;
         }
+
+        if (layr->dn == NULL) {
+                cfpkt_destroy(pkt);
+                return -ENODEV;
+
+        }
         return layr->dn->transmit(layr->dn, pkt);
 }
 
 static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
                                         int phyid)
 {
-        if (layr->up->ctrlcmd)
+        if (layr->up && layr->up->ctrlcmd)
                 layr->up->ctrlcmd(layr->up, ctrl, layr->id);
 }