linux-kernel - Re: [PATCH] usb: usb-acpi: fix uninitialized variable in usb_acpi_get_connect

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Message-ID: <eb25d06f-775c-43f9-9e7e-4f859f6cc41c@moroto.mountain>
Date: Fri, 15 Mar 2024 21:43:56 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] usb: usb-acpi: fix uninitialized variable in
 usb_acpi_get_connect_type()

On Fri, Mar 15, 2024 at 05:36:16PM +0200, Mathias Nyman wrote:
> On 15.3.2024 17.21, Dan Carpenter wrote:
> > The "pld" pointer is uninitialized if acpi_get_physical_device_location()
> > fails.  Initialize it to NULL.
> > 
> > Fixes: f3ac348e6e04 ("usb: usb-acpi: Set port connect type of not connectable ports correctly")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> > ---
> 
> I sent a similar patch a week ago, just before merge window opened.
> looks like it didn't make it.
> 
> https://lore.kernel.org/linux-usb/20240308113425.1144689-1-mathias.nyman@linux.intel.com/

Huh.  That's interesting that this bug was causing issues in real life.
I thought everyone was using the GCC extension to zero stack variables.
I've only been fixing uninitialized variable bugs out of sense of
stubbornness and to boost my patch count.  :P

regards,
dan carpenter