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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2012-08-20 13:35:23 +0100
committerStefan Hajnoczi <stefanha@gmail.com>2012-09-14 08:40:32 +0100
commit06b5f36d052b540a59b52150582d65674199b2ce (patch)
treec3ecb857f9a9730930ade0995ad3f13ecf05ac50
parentc67f5dc10573687497f0f5c3aec19b15c35c63d7 (diff)
downloadqemu-arm-06b5f36d052b540a59b52150582d65674199b2ce.tar.gz
net: do not report queued packets as sent
Net send functions have a return value where 0 means the packet has not been sent and will be queued. A non-zero value means the packet was sent or an error caused the packet to be dropped. This patch fixes two instances where packets are queued but we return their size. This causes callers to believe the packets were sent. When the caller uses the async send interface this creates a real problem because the callback will be invoked for a packet that the caller believed to be already sent. This bug can cause double-frees in the caller. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
-rw-r--r--net/queue.c35
1 files changed, 16 insertions, 19 deletions
diff --git a/net/queue.c b/net/queue.c
index 6e64091463..254f28013a 100644
--- a/net/queue.c
+++ b/net/queue.c
@@ -83,12 +83,12 @@ void qemu_del_net_queue(NetQueue *queue)
g_free(queue);
}
-static ssize_t qemu_net_queue_append(NetQueue *queue,
- NetClientState *sender,
- unsigned flags,
- const uint8_t *buf,
- size_t size,
- NetPacketSent *sent_cb)
+static void qemu_net_queue_append(NetQueue *queue,
+ NetClientState *sender,
+ unsigned flags,
+ const uint8_t *buf,
+ size_t size,
+ NetPacketSent *sent_cb)
{
NetPacket *packet;
@@ -100,16 +100,14 @@ static ssize_t qemu_net_queue_append(NetQueue *queue,
memcpy(packet->data, buf, size);
QTAILQ_INSERT_TAIL(&queue->packets, packet, entry);
-
- return size;
}
-static ssize_t qemu_net_queue_append_iov(NetQueue *queue,
- NetClientState *sender,
- unsigned flags,
- const struct iovec *iov,
- int iovcnt,
- NetPacketSent *sent_cb)
+static void qemu_net_queue_append_iov(NetQueue *queue,
+ NetClientState *sender,
+ unsigned flags,
+ const struct iovec *iov,
+ int iovcnt,
+ NetPacketSent *sent_cb)
{
NetPacket *packet;
size_t max_len = 0;
@@ -133,8 +131,6 @@ static ssize_t qemu_net_queue_append_iov(NetQueue *queue,
}
QTAILQ_INSERT_TAIL(&queue->packets, packet, entry);
-
- return packet->size;
}
static ssize_t qemu_net_queue_deliver(NetQueue *queue,
@@ -177,7 +173,8 @@ ssize_t qemu_net_queue_send(NetQueue *queue,
ssize_t ret;
if (queue->delivering || !qemu_can_send_packet(sender)) {
- return qemu_net_queue_append(queue, sender, flags, data, size, sent_cb);
+ qemu_net_queue_append(queue, sender, flags, data, size, sent_cb);
+ return 0;
}
ret = qemu_net_queue_deliver(queue, sender, flags, data, size);
@@ -201,8 +198,8 @@ ssize_t qemu_net_queue_send_iov(NetQueue *queue,
ssize_t ret;
if (queue->delivering || !qemu_can_send_packet(sender)) {
- return qemu_net_queue_append_iov(queue, sender, flags,
- iov, iovcnt, sent_cb);
+ qemu_net_queue_append_iov(queue, sender, flags, iov, iovcnt, sent_cb);
+ return 0;
}
ret = qemu_net_queue_deliver_iov(queue, sender, flags, iov, iovcnt);