Re: [PATCH v4] lan743x: fix for potential NULL pointer dereference with bare card

From: Jakub Kicinski
Date: Tue Dec 15 2020 - 20:13:41 EST


On Tue, 15 Dec 2020 23:39:14 +0000 patchwork-bot+netdevbpf@xxxxxxxxxx
wrote:
> Hello:
>
> This patch was applied to bpf/bpf.git (refs/heads/master):
>
> On Tue, 15 Dec 2020 19:12:45 +0300 you wrote:
> > This is the 4th revision of the patch fix for potential null pointer dereference
> > with lan743x card.
> >
> > The simpliest way to reproduce: boot with bare lan743x and issue "ethtool ethN"
> > command where ethN is the interface with lan743x card. Example:
> >
> > $ sudo ethtool eth7
> > dmesg:
> > [ 103.510336] BUG: kernel NULL pointer dereference, address: 0000000000000340
> > ...
> > [ 103.510836] RIP: 0010:phy_ethtool_get_wol+0x5/0x30 [libphy]
> > ...
> > [ 103.511629] Call Trace:
> > [ 103.511666] lan743x_ethtool_get_wol+0x21/0x40 [lan743x]
> > [ 103.511724] dev_ethtool+0x1507/0x29d0
> > [ 103.511769] ? avc_has_extended_perms+0x17f/0x440
> > [ 103.511820] ? tomoyo_init_request_info+0x84/0x90
> > [ 103.511870] ? tomoyo_path_number_perm+0x68/0x1e0
> > [ 103.511919] ? tty_insert_flip_string_fixed_flag+0x82/0xe0
> > [ 103.511973] ? inet_ioctl+0x187/0x1d0
> > [ 103.512016] dev_ioctl+0xb5/0x560
> > [ 103.512055] sock_do_ioctl+0xa0/0x140
> > [ 103.512098] sock_ioctl+0x2cb/0x3c0
> > [ 103.512139] __x64_sys_ioctl+0x84/0xc0
> > [ 103.512183] do_syscall_64+0x33/0x80
> > [ 103.512224] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > [ 103.512274] RIP: 0033:0x7f54a9cba427
> > ...
> >
> > [...]
>
> Here is the summary with links:
> - [v4] lan743x: fix for potential NULL pointer dereference with bare card
> https://git.kernel.org/bpf/bpf/c/e9e13b6adc33
>
> You are awesome, thank you!
> --
> Deet-doot-dot, I am a bot.
> https://korg.docs.kernel.org/patchwork/pwbot.html
>

Heh the bot got confused, I think.

What I meant when I said "let's wait for the merge window" was that
the patch will not hit upstream until the merge window. It's now in
Linus's tree. I'll make a submission of stable patches to Greg at the
end of the week and I'll include this patch.

Thanks!