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net/devif: reprepare iob buffer before polling connections

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Loopback device will consume the d_iob packet in upper layer protocol,
in order to avoid null pointer access, reprepare iob buffer before polling connections

Signed-off-by: chao an <anchao@xiaomi.com>
This commit is contained in:
chao an 2022-12-05 13:12:14 +08:00 committed by Xiang Xiao
parent 922c4df7ef
commit e002edf87c
1 changed files with 13 additions and 17 deletions
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30
net/devif/devif_poll.c
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@ -645,7 +645,7 @@ static inline int devif_poll_tcp_connections(FAR struct net_driver_s *dev,
static int devif_poll_connections(FAR struct net_driver_s *dev,
devif_poll_callback_t callback)
{
int bstop;
int bstop = false;
/* Traverse all of the active packet connections and perform the poll
* action.
@ -903,8 +903,8 @@ static int devif_poll_callback(FAR struct net_driver_s *dev)
int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
{
uint16_t llhdrlen;
int bstop = false;
FAR uint8_t *buf;
int bstop;
if (dev->d_buf == NULL)
{
@ -913,17 +913,18 @@ int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
buf = dev->d_buf;
/* Device polling, prepare iob buffer */
if (netdev_iob_prepare(dev, false, 0) != OK)
{
return true;
}
llhdrlen = NET_LL_HDRLEN(dev);
do
{
/* Device polling, prepare iob buffer */
if (netdev_iob_prepare(dev, false, 0) != OK)
{
bstop = true;
break;
}
/* Perform all connections poll */
bstop = devif_poll_connections(dev, devif_poll_callback);
@ -951,18 +952,13 @@ int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
if (dev->d_buf != buf)
{
if (dev->d_buf == NULL)
buf = dev->d_buf;
if (buf == NULL)
{
break;
}
buf = dev->d_buf;
}
/* Finish copy, reset iob */
netdev_iob_prepare(dev, false, 0);
iob_update_pktlen(dev->d_iob, 0);
}
}
while (bstop);