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| author | Wei Fang <wei.fang@nxp.com> | 2022-12-19 05:27:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-31 15:32:56 +0300 |
| commit | 1373e1b7206de7464b266475def8925afc54cdd5 (patch) | |
| tree | a017e9286bbde353f7d04290ff5f1c84aa7d6665 /drivers/net | |
| parent | 8a37cf11dc78b71a5e0ef18aa33af41415b5ca38 (diff) | |
| download | linux-1373e1b7206de7464b266475def8925afc54cdd5.tar.xz | |
net: fec: check the return value of build_skb()
[ Upstream commit 19e72b064fc32cd58f6fc0b1eb64ac2e4f770e76 ]
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: 95698ff6177b ("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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/freescale/fec_main.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 23e1a94b9ce4..f250b0df27fb 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -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); |