Re: [PATCH] gainfar.c : skb_over_panic (kernel-

From: David Miller
Date: Thu Jun 24 2010 - 17:52:17 EST

From: Eran Liberty <liberty@xxxxxxxxxxxx>
Date: Thu, 24 Jun 2010 12:53:23 +0300

> Fix possible skb_over_panic event in Freescale's "gianfar" driver.
> The skb_over_panic occurs due to calling skb_put() within
> gfar_clean_rx_ring(). This happens if (and only if) shortly prior to
> the event and a few lined above the skb_put(), an skb was queued back
> to the priv->rx_recycle queue due to RXBD_LAST or RXBD_ERR status.
> The skb is queued without properly re-setting its state.
> The patch properly reset the skb state.
> I have tested this patch on MPC8548 based product and asserted it
> avoided the skb_over_panic event.
> Signed-off-by: Eran Liberty <liberty@xxxxxxxxxxxx>

Eran, this seems to be fixed already. The code in the current
tree now reads:

* We need to un-reserve() the skb to what it
* was before gfar_new_skb() re-aligned
* it to an RXBUF_ALIGNMENT boundary
* before we put the skb back on the
* recycle list.
skb_reserve(skb, -GFAR_CB(skb)->alignamount);
__skb_queue_head(&priv->rx_recycle, skb);
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