linux-kernel - Re: [PATCH v3] lan743x: fix for potential NULL pointer dereference with bare card

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Date:   Tue, 3 Nov 2020 17:38:33 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sergej Bauer <sbauer@...ckbox.su>
Cc:     andrew@...n.ch, Markus.Elfring@....de,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] lan743x: fix for potential NULL pointer dereference
 with bare card

On Mon,  2 Nov 2020 01:35:55 +0300 Sergej Bauer wrote:
> This is the 3rd 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"
> commant 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

Applied, thanks!