From: Xie He xie.he.0141@gmail.com
[ Upstream commit 5fce1e43e2d5bf2f7e3224d7b99b1c65ab2c26e2 ]
This driver calls ether_setup to set up the network device. The ether_setup function would add the IFF_TX_SKB_SHARING flag to the device. This flag indicates that it is safe to transmit shared skbs to the device.
However, this is not true. This driver may pad the frame (in eth_tx) before transmission, so the skb may be modified.
Fixes: 550fd08c2ceb ("net: Audit drivers to identify those needing IFF_TX_SKB_SHARING cleared") Cc: Neil Horman nhorman@tuxdriver.com Cc: Krzysztof Halasa khc@pm.waw.pl Signed-off-by: Xie He xie.he.0141@gmail.com Link: https://lore.kernel.org/r/20201020063420.187497-1-xie.he.0141@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wan/hdlc_raw_eth.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/net/wan/hdlc_raw_eth.c +++ b/drivers/net/wan/hdlc_raw_eth.c @@ -102,6 +102,7 @@ static int raw_eth_ioctl(struct net_devi old_qlen = dev->tx_queue_len; ether_setup(dev); dev->tx_queue_len = old_qlen; + dev->priv_flags &= ~IFF_TX_SKB_SHARING; eth_hw_addr_random(dev); call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); netif_dormant_off(dev);