From: Dongliang Mu mudongliangabcd@gmail.com
commit a6ecfb39ba9d7316057cea823b196b734f6b18ca upstream.
The current error handling code of hso_create_net_device is hso_free_net_device, no matter which errors lead to. For example, WARNING in hso_free_net_device [1].
Fix this by refactoring the error handling code of hso_create_net_device by handling different errors by different code.
[1] https://syzkaller.appspot.com/bug?id=66eff8d49af1b28370ad342787413e35bbe76ef...
Reported-by: syzbot+44d53c7255bb1aea22d2@syzkaller.appspotmail.com Fixes: 5fcfb6d0bfcd ("hso: fix bailout in error case of probe") Signed-off-by: Dongliang Mu mudongliangabcd@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/usb/hso.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-)
--- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -2522,7 +2522,7 @@ static struct hso_device *hso_create_net hso_net_init); if (!net) { dev_err(&interface->dev, "Unable to create ethernet device\n"); - goto exit; + goto err_hso_dev; }
hso_net = netdev_priv(net); @@ -2535,13 +2535,13 @@ static struct hso_device *hso_create_net USB_DIR_IN); if (!hso_net->in_endp) { dev_err(&interface->dev, "Can't find BULK IN endpoint\n"); - goto exit; + goto err_net; } hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT); if (!hso_net->out_endp) { dev_err(&interface->dev, "Can't find BULK OUT endpoint\n"); - goto exit; + goto err_net; } SET_NETDEV_DEV(net, &interface->dev); SET_NETDEV_DEVTYPE(net, &hso_type); @@ -2551,21 +2551,21 @@ static struct hso_device *hso_create_net hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL); if (!hso_net->mux_bulk_rx_urb_pool[i]) { dev_err(&interface->dev, "Could not allocate rx urb\n"); - goto exit; + goto err_mux_bulk_rx; } hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE, GFP_KERNEL); if (!hso_net->mux_bulk_rx_buf_pool[i]) - goto exit; + goto err_mux_bulk_rx; } hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL); if (!hso_net->mux_bulk_tx_urb) { dev_err(&interface->dev, "Could not allocate tx urb\n"); - goto exit; + goto err_mux_bulk_rx; } hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL); if (!hso_net->mux_bulk_tx_buf) - goto exit; + goto err_free_tx_urb;
add_net_device(hso_dev);
@@ -2573,7 +2573,7 @@ static struct hso_device *hso_create_net result = register_netdev(net); if (result) { dev_err(&interface->dev, "Failed to register device\n"); - goto exit; + goto err_free_tx_buf; }
hso_log_port(hso_dev); @@ -2581,8 +2581,21 @@ static struct hso_device *hso_create_net hso_create_rfkill(hso_dev, interface);
return hso_dev; -exit: - hso_free_net_device(hso_dev); + +err_free_tx_buf: + remove_net_device(hso_dev); + kfree(hso_net->mux_bulk_tx_buf); +err_free_tx_urb: + usb_free_urb(hso_net->mux_bulk_tx_urb); +err_mux_bulk_rx: + for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) { + usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]); + kfree(hso_net->mux_bulk_rx_buf_pool[i]); + } +err_net: + free_netdev(net); +err_hso_dev: + kfree(hso_dev); return NULL; }