Re: [PATCH net] net: bcmgenet: fix NULL dereference in set_coalesce before first open

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Mon, 28 Sep 2026 12:56:41 +0200 you wrote:
> The Rx ring priv and index are only set in bcmgenet_init_rx_ring(),
> which runs at open. Setting the Rx coalescing parameters on an interface
> that was never opened, e.g. "ethtool -C eth0 rx-usecs 50", dereferences
> a NULL ring->priv. The oops happens with RTNL held, so networking
> stays stuck until a reboot:
> 
>   Unable to handle kernel paging request at virtual address 0000000000002788
>   pc : bcmgenet_set_rx_coalesce.isra.0+0x10/0x88
>   lr : bcmgenet_set_coalesce+0xe8/0x180
>   Call trace:
>    bcmgenet_set_rx_coalesce.isra.0+0x10/0x88 (P)
>    __ethnl_set_coalesce.isra.0+0x490/0x570
>    ethnl_set_coalesce+0x48/0xc0
>    ethnl_default_set_doit+0xf4/0x230
>    genl_family_rcv_msg_doit+0xe8/0x160
>    genl_rcv_msg+0x220/0x2a0
>    netlink_rcv_skb+0x68/0x140
>    genl_rcv+0x40/0x60
>    netlink_unicast+0x338/0x3c0
>    netlink_sendmsg+0x19c/0x3f8
>    __sock_sendmsg+0x64/0xc0
>    __sys_sendto+0x124/0x198
>    __arm64_sys_sendto+0x30/0x48
> 
> [...]

Here is the summary with links:
  - [net] net: bcmgenet: fix NULL dereference in set_coalesce before first open
    https://git.kernel.org/netdev/net/c/19419faf58df

You are awesome, thank you!
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