linux-kernel - Re: [PATCH v2 -next] usb/usbip: fix wrong data added to platform device

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Date:   Mon, 16 Oct 2023 19:42:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Hongren Zheng <i@...ithal.me>
Cc:     Shuah Khan <shuah@...nel.org>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        sfr@...b.auug.org.au
Subject: Re: [PATCH v2 -next] usb/usbip: fix wrong data added to platform
 device

On Sat, Oct 14, 2023 at 03:46:04PM +0800, Hongren Zheng wrote:
> .data of platform_device_info will be copied into .platform_data of
> struct device via platform_device_add_data.

That is crazy.

> However, vhcis[i] contains a spinlock, is dynamically allocated and
> used by other code, so it is not meant to be copied. The workaround
> was to use void *vhci as an agent, but it was removed in the commit
> suggested below.

Again, crazy, I'm amazed it works at all.

> This patch adds back the workaround and changes the way of using
> platform_data accordingly.
> 
> Reported-by: syzbot+e0dbc33630a092ccf033@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/r/00000000000029242706077f3145@google.com/
> Reported-by: syzbot+6867a9777f4b8dc4e256@...kaller.appspotmail.com
> Closes: https://lore.kernel.org/r/0000000000007634c1060793197c@google.com/
> Fixes: b8aaf639b403 ("usbip: Use platform_device_register_full()")
> Tested-by: syzbot+6867a9777f4b8dc4e256@...kaller.appspotmail.com
> Link: https://lore.kernel.org/r/0000000000007ac87d0607979b6b@google.com/
> Signed-off-by: Hongren Zheng <i@...ithal.me>
> ---
>  drivers/usb/usbip/vhci_hcd.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)

I'll take this now, as it fixes a reported issue, but really, the root
problem should be fixed instead.  This is not how to treat platform data
at all.

thanks,

greg k-h