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p54spi: compensate firmware alignment bug in p54spi_rx 

Firmware may insert up to 4 padding bytes after the lmac header,
but it does not amend the size of SPI data transfer.
Such packets has correct data size in header, thus referencing
past the end of allocated skb. Put extra 4 bytes to the end of the
received skb to compensate for this case.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Max Filippov 2009-03-27 07:50:53 +03:00 committed by John W. Linville
parent 488829f1b1
commit 9f201a8783
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/wireless/p54/p54spi.c
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@ -395,7 +395,12 @@ static int p54spi_rx(struct p54s_priv *priv)
return 0;
}
skb = dev_alloc_skb(len);
/* Firmware may insert up to 4 padding bytes after the lmac header,
* but it does not amend the size of SPI data transfer.
* Such packets has correct data size in header, thus referencing
* past the end of allocated skb. Reserve extra 4 bytes for this case */
skb = dev_alloc_skb(len + 4);
if (!skb) {
dev_err(&priv->spi->dev, "could not alloc skb");
return 0;
@ -403,6 +408,9 @@ static int p54spi_rx(struct p54s_priv *priv)
p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, skb_put(skb, len), len);
p54spi_sleep(priv);
/* Put additional bytes to compensate for the possible
* alignment-caused truncation */
skb_put(skb, 4);
if (p54_rx(priv->hw, skb) == 0)
dev_kfree_skb(skb);