linux-kernel - Re: Unitialized Variable and Null Pointer Dereference bug in gb_bootrom_get

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Date:   Tue, 21 Jun 2022 16:48:32 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     vireshk@...nel.org, Johan Hovold <johan@...nel.org>,
        elder@...nel.org, greybus-dev@...ts.linaro.org,
        linux-staging@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Unitialized Variable and Null Pointer Dereference bug in
 gb_bootrom_get_firmware

On Tue, Jun 21, 2022 at 10:36:04PM +0800, Dongliang Mu wrote:
> Hi maintainers,
> 
> I would like to send one bug report.
> 
> In gb_bootrom_get_firmware, if the first branch is satisfied, it will
> go to queue_work, leading to the dereference of uninitialized const
> variable "fw". If the second branch is satisfied, it will go to unlock
> with fw as NULL pointer, leading to a NULL Pointer Dereference.
> 
> The Fixes commit should be [1], introducing the dereference of "fw" in
> the error handling code.
> 
> I am not sure how to fix this bug. Any comment on removing the
> dereference of fw?

As Johan said, please fix up your tool that found this, it is not
working properly.

thanks,

greg k-h