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net: fec: check the return value of build_skb()

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[ Upstream commit 19e72b064f ]

The build_skb might return a null pointer but there is no check on the
return value in the fec_enet_rx_queue(). So a null pointer dereference
might occur. To avoid this, we check the return value of build_skb. If
the return value is a null pointer, the driver will recycle the page and
update the statistic of ndev. Then jump to rx_processing_done to clear
the status flags of the BD so that the hardware can recycle the BD.

Fixes: 95698ff617 ("net: fec: using page pool to manage RX buffers")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Shenwei Wang <Shenwei.wang@nxp.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Link: https://lore.kernel.org/r/20221219022755.1047573-1-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wei Fang 2022-12-19 10:27:55 +08:00 committed by Greg Kroah-Hartman
parent 8a37cf11dc
commit 1373e1b720
1 changed files with 8 additions and 0 deletions
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8
drivers/net/ethernet/freescale/fec_main.c
View file

@ -1642,6 +1642,14 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
* bridging applications.
*/
skb = build_skb(page_address(page), PAGE_SIZE);
if (unlikely(!skb)) {
page_pool_recycle_direct(rxq->page_pool, page);
ndev->stats.rx_dropped++;
netdev_err_once(ndev, "build_skb failed!\n");
goto rx_processing_done;
}
skb_reserve(skb, FEC_ENET_XDP_HEADROOM);
skb_put(skb, pkt_len - 4);
skb_mark_for_recycle(skb);