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| author | Bernard Pidoux <f6bvp@amsat.org> | 2009-03-21 13:33:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-21 13:33:55 -0700 |
| commit | f99bcff7a290768e035f3d4726e103c6ebe858bf (patch) | |
| tree | 1e172c814ccdf2839b8cc6b736a2db309ec0318b /net | |
| parent | 60784427ab331dc13c070ac4b0cc9a735bdfa9c0 (diff) | |
| download | linux-stable-f99bcff7a290768e035f3d4726e103c6ebe858bf.tar.gz linux-stable-f99bcff7a290768e035f3d4726e103c6ebe858bf.tar.bz2 linux-stable-f99bcff7a290768e035f3d4726e103c6ebe858bf.zip | |
ax25: zero length frame filtering in AX25
In previous commit 244f46ae6e9e18f6fc0be7d1f49febde4762c34b
was introduced a zero length frame filter for ROSE protocole.
This patch has the same purpose at AX25 frame level for the same
reason. Empty frames have no meaning in AX25 protocole.
Signed-off-by: Bernard Pidoux <f6bvp@amsat.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ax25/af_ax25.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index fd9d06f291dc..7da5ebb84e97 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1435,6 +1435,11 @@ static int ax25_sendmsg(struct kiocb *iocb, struct socket *sock, size_t size; int lv, err, addr_len = msg->msg_namelen; + /* AX.25 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; @@ -1634,6 +1639,13 @@ static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock, skb_reset_transport_header(skb); copied = skb->len; + /* AX.25 empty data frame has no meaning : ignore it */ + if (copied == 0) { + err = copied; + skb_free_datagram(sk, skb); + goto out; + } + if (copied > size) { copied = size; msg->msg_flags |= MSG_TRUNC; |