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=66eff8d49af1b28370ad342787413e35bbe76efe
Reported-by: [email protected]
Fixes: 5fcfb6d0bfcd ("hso: fix bailout in error case of probe")
Signed-off-by: Dongliang Mu <[email protected]>
---
drivers/net/usb/hso.c | 33 +++++++++++++++++++++++----------
1 file changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 54ef8492ca01..39c4e88eab62 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2495,7 +2495,7 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
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);
@@ -2508,13 +2508,13 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
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);
@@ -2523,18 +2523,18 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!hso_net->mux_bulk_rx_urb_pool[i])
- 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)
- 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_mux_bulk_tx;
add_net_device(hso_dev);
@@ -2542,7 +2542,7 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
result = register_netdev(net);
if (result) {
dev_err(&interface->dev, "Failed to register device\n");
- goto exit;
+ goto err_register;
}
hso_log_port(hso_dev);
@@ -2550,8 +2550,21 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
hso_create_rfkill(hso_dev, interface);
return hso_dev;
-exit:
- hso_free_net_device(hso_dev, true);
+
+err_register:
+ remove_net_device(hso_dev);
+ kfree(hso_net->mux_bulk_tx_buf);
+err_mux_bulk_tx:
+ 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;
}
--
2.25.1
On Wed, Jul 14, 2021 at 4:11 PM Dongliang Mu <[email protected]> wrote:
>
> 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.
>
Hi Dan,
Please take a look at this version. I forget about the changelog about
this patch. I will send a version v3 with your further comment if you
have.
> [1] https://syzkaller.appspot.com/bug?id=66eff8d49af1b28370ad342787413e35bbe76efe
>
> Reported-by: [email protected]
> Fixes: 5fcfb6d0bfcd ("hso: fix bailout in error case of probe")
> Signed-off-by: Dongliang Mu <[email protected]>
> ---
> drivers/net/usb/hso.c | 33 +++++++++++++++++++++++----------
> 1 file changed, 23 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index 54ef8492ca01..39c4e88eab62 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -2495,7 +2495,7 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> 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);
> @@ -2508,13 +2508,13 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> 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);
> @@ -2523,18 +2523,18 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
> hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
> if (!hso_net->mux_bulk_rx_urb_pool[i])
> - 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)
> - 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_mux_bulk_tx;
>
> add_net_device(hso_dev);
>
> @@ -2542,7 +2542,7 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> result = register_netdev(net);
> if (result) {
> dev_err(&interface->dev, "Failed to register device\n");
> - goto exit;
> + goto err_register;
> }
>
> hso_log_port(hso_dev);
> @@ -2550,8 +2550,21 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> hso_create_rfkill(hso_dev, interface);
>
> return hso_dev;
> -exit:
> - hso_free_net_device(hso_dev, true);
> +
> +err_register:
> + remove_net_device(hso_dev);
> + kfree(hso_net->mux_bulk_tx_buf);
> +err_mux_bulk_tx:
> + 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;
> }
>
> --
> 2.25.1
>
On Wed, Jul 14, 2021 at 04:14:18PM +0800, Dongliang Mu wrote:
> > @@ -2523,18 +2523,18 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> > for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
> > hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
> > if (!hso_net->mux_bulk_rx_urb_pool[i])
> > - 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)
> > - 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_mux_bulk_tx;
I would probably have called this err free_tx_urb or something like
that.
> >
> > add_net_device(hso_dev);
> >
> > @@ -2542,7 +2542,7 @@ static struct hso_device *hso_create_net_device(struct usb_interface *interface,
> > result = register_netdev(net);
> > if (result) {
> > dev_err(&interface->dev, "Failed to register device\n");
> > - goto exit;
> > + goto err_register;
This is still Come From style. I wouldn't have commented except that
you said you are giong to redo the patch for other reasons.
It looks good. Straight forward to review now.
regards,
dan carpenter