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authorBernard Pidoux <f6bvp@amsat.org>2009-03-21 13:34:20 -0700
committerDavid S. Miller <davem@davemloft.net>2009-03-21 13:34:20 -0700
commita3ac80a130300573de351083cf4a5b46d233e8bf (patch)
tree60ae14aecdec93a6cea76b5e583af4d61f9c9ec8 /net/netrom
parentf99bcff7a290768e035f3d4726e103c6ebe858bf (diff)
downloadkernel-a3ac80a130300573de351083cf4a5b46d233e8bf.tar.gz
netrom: zero length frame filtering in NetRom
A zero length frame filter was recently introduced in ROSE protocole. Previous commit makes the same at AX25 protocole level. This patch has the same purpose for NetRom protocole. The reason is that empty frames have no meaning in NetRom protocole. Signed-off-by: Bernard Pidoux <f6bvp@amsat.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom')
-rw-r--r--net/netrom/af_netrom.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index cba7849de98e..6d9c58ec56ac 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1037,6 +1037,10 @@ static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
unsigned char *asmptr;
int size;
+ /* Netrom empty data frame has no meaning : don't send */
+ if (len == 0)
+ return 0;
+
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
return -EINVAL;
@@ -1167,6 +1171,11 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
skb_reset_transport_header(skb);
copied = skb->len;
+ /* NetRom empty data frame has no meaning : ignore it */
+ if (copied == 0) {
+ goto out;
+ }
+
if (copied > size) {
copied = size;
msg->msg_flags |= MSG_TRUNC;
@@ -1182,7 +1191,7 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
msg->msg_namelen = sizeof(*sax);
- skb_free_datagram(sk, skb);
+out: skb_free_datagram(sk, skb);
release_sock(sk);
return copied;