Messages in this thread Patch in this message |  | | From | Aleksander Jan Bajkowski <> | Subject | [PATCH net 1/2] net: lantiq_xrx200: confirm skb is allocated before using | Date | Sun, 17 Jul 2022 21:48:23 +0200 |
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xrx200_hw_receive() assumes build_skb() always works and goes straight to skb_reserve(). However, build_skb() can fail under memory pressure.
Add a check in case build_skb() failed to allocate and return NULL.
Fixes: e015593573b3 ("net: lantiq_xrx200: convert to build_skb ") Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl> --- drivers/net/ethernet/lantiq_xrx200.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index 5edb68a8aab1..6a83a6c19484 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -239,6 +239,13 @@ static int xrx200_hw_receive(struct xrx200_chan *ch) } skb = build_skb(buf, priv->rx_skb_size); + if (!skb) { + skb_free_frag(buf); + net_dev->stats.rx_dropped++; + netdev_err(net_dev, "failed to build skb\n"); + return -ENOMEM; + } + skb_reserve(skb, NET_SKB_PAD); skb_put(skb, len); -- 2.30.2
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