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    Subject[PATCH 5.19 093/158] net: lantiq_xrx200: restore buffer if memory allocation failed
    Date
    From: Aleksander Jan Bajkowski <olek2@wp.pl>

    [ Upstream commit c9c3b1775f80fa21f5bff874027d2ccb10f5d90c ]

    In a situation where memory allocation fails, an invalid buffer address
    is stored. When this descriptor is used again, the system panics in the
    build_skb() function when accessing memory.

    Fixes: 7ea6cd16f159 ("lantiq: net: fix duplicated skb in rx descriptor ring")
    Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/net/ethernet/lantiq_xrx200.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c
    index 25adce7f0c7c0..57f27cc7724e7 100644
    --- a/drivers/net/ethernet/lantiq_xrx200.c
    +++ b/drivers/net/ethernet/lantiq_xrx200.c
    @@ -193,6 +193,7 @@ static int xrx200_alloc_buf(struct xrx200_chan *ch, void *(*alloc)(unsigned int

    ch->rx_buff[ch->dma.desc] = alloc(priv->rx_skb_size);
    if (!ch->rx_buff[ch->dma.desc]) {
    + ch->rx_buff[ch->dma.desc] = buf;
    ret = -ENOMEM;
    goto skip;
    }
    --
    2.35.1


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