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ipheth: potential null dereferences on error path

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The calls to usb_free_buffer() dereference rx_urb and tx_urb in the
parameter list but those could be NULL.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: L. Alberto Giménez <agimenez@sysvalve.es>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2010-04-26 23:20:12 +00:00 committed by David S. Miller
parent 2a91515722
commit d87ff58fda
1 changed files with 8 additions and 7 deletions
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15
drivers/net/usb/ipheth.c
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@ -122,25 +122,25 @@ static int ipheth_alloc_urbs(struct ipheth_device *iphone)
tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (tx_urb == NULL)
goto error;
goto error_nomem;
rx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (rx_urb == NULL)
goto error;
goto free_tx_urb;
tx_buf = usb_buffer_alloc(iphone->udev,
IPHETH_BUF_SIZE,
GFP_KERNEL,
&tx_urb->transfer_dma);
if (tx_buf == NULL)
goto error;
goto free_rx_urb;
rx_buf = usb_buffer_alloc(iphone->udev,
IPHETH_BUF_SIZE,
GFP_KERNEL,
&rx_urb->transfer_dma);
if (rx_buf == NULL)
goto error;
goto free_tx_buf;
iphone->tx_urb = tx_urb;
@ -149,13 +149,14 @@ static int ipheth_alloc_urbs(struct ipheth_device *iphone)
iphone->rx_buf = rx_buf;
return 0;
error:
usb_buffer_free(iphone->udev, IPHETH_BUF_SIZE, rx_buf,
rx_urb->transfer_dma);
free_tx_buf:
usb_buffer_free(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
tx_urb->transfer_dma);
free_rx_urb:
usb_free_urb(rx_urb);
free_tx_urb:
usb_free_urb(tx_urb);
error_nomem:
return -ENOMEM;
}