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SubjectRe: [PATCH net v3] team: fix null-ptr-deref when team device type is changed
On Tue, Sep 05, 2023 at 04:10:56PM +0800, Ziyang Xuan wrote:
> ---
> drivers/net/team/team.c | 5 ++++-
> net/ethernet/eth.c | 1 +
> 2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
> index d3dc22509ea5..12fb5f4cff06 100644
> --- a/drivers/net/team/team.c
> +++ b/drivers/net/team/team.c
> @@ -2127,7 +2127,10 @@ static const struct ethtool_ops team_ethtool_ops = {
> static void team_setup_by_port(struct net_device *dev,
> struct net_device *port_dev)
> {
> - dev->header_ops = port_dev->header_ops;
> + if (port_dev->type == ARPHRD_ETHER)
> + dev->header_ops = &eth_header_ops;
> + else
> + dev->header_ops = port_dev->header_ops;
> dev->type = port_dev->type;
> dev->hard_header_len = port_dev->hard_header_len;
> dev->needed_headroom = port_dev->needed_headroom;
> diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
> index 2edc8b796a4e..157833509adb 100644
> --- a/net/ethernet/eth.c
> +++ b/net/ethernet/eth.c
> @@ -347,6 +347,7 @@ const struct header_ops eth_header_ops ____cacheline_aligned = {
> .cache_update = eth_header_cache_update,
> .parse_protocol = eth_header_parse_protocol,
> };
> +EXPORT_SYMBOL(eth_header_ops);
>
> /**
> * ether_setup - setup Ethernet network device
> --
> 2.25.1
>

Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>

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