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| author | Wolfram Sang <w.sang@pengutronix.de> | 2010-11-16 09:50:47 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-11-16 09:50:47 -0800 |
| commit | 4c62ab9c538bc09c38093fa079e6902ea4d42b98 (patch) | |
| tree | d67bb872f84197369d82985702b6517a7a3f289a /net/irda/irttp.c | |
| parent | 3b42a96dc7870c53d20b419185737d3b8f7a7b74 (diff) | |
| download | linux-4c62ab9c538bc09c38093fa079e6902ea4d42b98.tar.gz linux-4c62ab9c538bc09c38093fa079e6902ea4d42b98.tar.bz2 linux-4c62ab9c538bc09c38093fa079e6902ea4d42b98.zip | |
irda: irttp: allow zero byte packets
Sending zero byte packets is not neccessarily an error (AF_INET accepts it,
too), so just apply a shortcut. This was discovered because of a non-working
software with WINE. See
http://bugs.winehq.org/show_bug.cgi?id=19397#c86
http://thread.gmane.org/gmane.linux.irda.general/1643
for very detailed debugging information and a testcase. Kudos to Wolfgang for
those!
Reported-by: Wolfgang Schwotzer <wolfgang.schwotzer@gmx.net>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Mike Evans <mike.evans@cardolan.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/irda/irttp.c')
| -rw-r--r-- | net/irda/irttp.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/net/irda/irttp.c b/net/irda/irttp.c index 285761e77d90..6cfaeaf2a370 100644 --- a/net/irda/irttp.c +++ b/net/irda/irttp.c @@ -550,16 +550,23 @@ EXPORT_SYMBOL(irttp_close_tsap); */ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) { + int ret = -1; + IRDA_ASSERT(self != NULL, return -1;); IRDA_ASSERT(self->magic == TTP_TSAP_MAGIC, return -1;); IRDA_ASSERT(skb != NULL, return -1;); IRDA_DEBUG(4, "%s()\n", __func__); + /* Take shortcut on zero byte packets */ + if (skb->len == 0) { + ret = 0; + goto err; + } + /* Check that nothing bad happens */ - if ((skb->len == 0) || (!self->connected)) { - IRDA_DEBUG(1, "%s(), No data, or not connected\n", - __func__); + if (!self->connected) { + IRDA_DEBUG(1, "%s(), Not connected\n", __func__); goto err; } @@ -576,7 +583,7 @@ int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb) err: dev_kfree_skb(skb); - return -1; + return ret; } EXPORT_SYMBOL(irttp_udata_request); @@ -599,9 +606,15 @@ int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb) IRDA_DEBUG(2, "%s() : queue len = %d\n", __func__, skb_queue_len(&self->tx_queue)); + /* Take shortcut on zero byte packets */ + if (skb->len == 0) { + ret = 0; + goto err; + } + /* Check that nothing bad happens */ - if ((skb->len == 0) || (!self->connected)) { - IRDA_WARNING("%s: No data, or not connected\n", __func__); + if (!self->connected) { + IRDA_WARNING("%s: Not connected\n", __func__); ret = -ENOTCONN; goto err; } |