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Broadcom CNIC core network driver: fix mem leak on allocation failures in cnic_alloc_uio_rings()

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We are leaking memory in drivers/net/cnic.c::cnic_alloc_uio_rings() if
either of the calls to dma_alloc_coherent() fail. This patch fixes it by
freeing both the memory allocated with kzalloc() and memory allocated with
previous calls to dma_alloc_coherent() when there's a failure.

Thanks to  Joe Perches <joe@perches.com>  for suggesting a better
implementation than my initial version.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Juhl 2010-12-31 11:18:48 -08:00 committed by David S. Miller
parent 2393c944d5
commit f7e4c9775e
1 changed files with 8 additions and 2 deletions
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10
drivers/net/cnic.c
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@ -940,7 +940,7 @@ static int cnic_alloc_uio_rings(struct cnic_dev *dev, int pages)
&udev->l2_ring_map,
GFP_KERNEL | __GFP_COMP);
if (!udev->l2_ring)
return -ENOMEM;
goto err_udev;
udev->l2_buf_size = (cp->l2_rx_ring_size + 1) * cp->l2_single_buf_size;
udev->l2_buf_size = PAGE_ALIGN(udev->l2_buf_size);
@ -948,7 +948,7 @@ static int cnic_alloc_uio_rings(struct cnic_dev *dev, int pages)
&udev->l2_buf_map,
GFP_KERNEL | __GFP_COMP);
if (!udev->l2_buf)
return -ENOMEM;
goto err_dma;
write_lock(&cnic_dev_lock);
list_add(&udev->list, &cnic_udev_list);
@ -959,6 +959,12 @@ static int cnic_alloc_uio_rings(struct cnic_dev *dev, int pages)
cp->udev = udev;
return 0;
err_dma:
dma_free_coherent(&udev->pdev->dev, udev->l2_ring_size,
udev->l2_ring, udev->l2_ring_map);
err_udev:
kfree(udev);
return -ENOMEM;
}
static int cnic_init_uio(struct cnic_dev *dev)