linux-kernel - Re: [PATCH] firmware: Always initialize the fw

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Message-ID: <20181001183216.GM2523@minitux>
Date:   Mon, 1 Oct 2018 11:32:16 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Niklas Cassel <niklas.cassel@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        stable@...r.kernel.org, Rishabh Bhatnagar <rishabhb@...eaurora.org>
Subject: Re: [PATCH] firmware: Always initialize the fw_priv list object

On Mon 01 Oct 11:18 PDT 2018, Luis Chamberlain wrote:

> On Mon, Oct 01, 2018 at 03:27:03PM +0200, Niklas Cassel wrote:
> > On Thu, Sep 20, 2018 at 12:34:15AM -0700, Bjorn Andersson wrote:
> > > On Wed 19 Sep 22:22 PDT 2018, Greg Kroah-Hartman wrote:
> > > 
> > > > On Wed, Sep 19, 2018 at 06:09:38PM -0700, Bjorn Andersson wrote:
> > > > > When freeing the fw_priv the item is taken off the list. This causes an
> > > > > oops in the FW_OPT_NOCACHE case as the list object is not initialized.
> > > > > 
> > > > > Make sure to initialize the list object regardless of this flag.
> > > > > 
> > > > > Fixes: 422b3db2a503 ("firmware: Fix security issue with request_firmware_into_buf()")
> > > > > Cc: stable@...r.kernel.org
> > > > > Cc: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> > > > > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > > > > ---
> > > > >  drivers/base/firmware_loader/main.c | 7 +++++--
> > > > >  1 file changed, 5 insertions(+), 2 deletions(-)
> > > > 
> > > > Is this being triggered by some hardware somewhere today?  Or is this
> > > > just a fix found by code inspection?
> > > > 
> > > 
> > > Hi Greg,
> > > 
> > > Yes, I found this issue while attempting to load the firmware and boot
> > > one of the DSPs on one of my Qualcomm dev boards after v4.19-rc4 and it
> > > can be reproduced on the upstream Dragonboard 820c.
> > 
> > I still see this issue on v4.19-rc6.
> > 
> > It would be nice if this fix gets merged before v4.19 gets released.
> 
> This is the first I hear of this and this patch, so you should re-send
> it and I can review it. Also please Cc Rishabh.
> 
> Rishabh, had you heard of this and can you confirm as well as
> 422b3db2a503 was your commit?
> 

Thanks Luis,

It seems like Greg did pick the patch yesterday [1], so hopefully he
sends himself a pull request this week for inclusion in v4.19-rc7.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git/log/?h=char-misc-linus

Regards,
Bjorn