linux-kernel - Re: [PATCH iio-next] iio: proximity: Fix use-after-free in hx9023s_send

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Message-ID: <20250118172101.009fe63a@jic23-huawei>
Date: Sat, 18 Jan 2025 17:21:01 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
Cc: lars@...afoo.de, jstephan@...libre.com, yasin.lee.x@...il.com,
 dan.carpenter@...aro.org, nuno.sa@...log.com, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH iio-next] iio: proximity: Fix use-after-free in
 hx9023s_send_cfg()

On Sun, 12 Jan 2025 11:53:14 +0000
Jonathan Cameron <jic23@...nel.org> wrote:

> On Tue,  7 Jan 2025 18:05:10 +0530
> Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com> wrote:
> 
> > Reorder the assignment of fw_size to happen before release_firmware()
> > to avoid accessing the firmware structure after it's been freed.
> > 
> > Fixes: e9ed97be4fcc ("iio: proximity: hx9023s: Added firmware file parsing functionality")
> > Closes: https://scan7.scan.coverity.com/#/project-view/52337/11354?selectedIssue=1602791
> > Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>  
> Gah. I didn't see this until after I'd sent the pull request.
> Never mind, we have plenty of time to get this in during the rc1 cycles.
> 
> I'll queue it up after rc1.
> 
> Thanks,
> 
> Jonathan
I've now queued it but on a fixes tree I can't push out just
yet because it will make a mess of linux-next (it is ahead
of some trees that come later in the merge order for next).

Anyhow, that will all resolve during the merge window and I'll rebase
on rc1.

Thanks,

Jonathan
> 
> > ---
> >  drivers/iio/proximity/hx9023s.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iio/proximity/hx9023s.c b/drivers/iio/proximity/hx9023s.c
> > index e092a935dbac..5aa8e5a22f32 100644
> > --- a/drivers/iio/proximity/hx9023s.c
> > +++ b/drivers/iio/proximity/hx9023s.c
> > @@ -1036,12 +1036,13 @@ static int hx9023s_send_cfg(const struct firmware *fw, struct hx9023s_data *data
> >  		return -ENOMEM;
> >  
> >  	memcpy(bin->data, fw->data, fw->size);
> > -	release_firmware(fw);
> >  
> >  	bin->fw_size = fw->size;
> >  	bin->fw_ver = bin->data[FW_VER_OFFSET];
> >  	bin->reg_count = get_unaligned_le16(bin->data + FW_REG_CNT_OFFSET);
> >  
> > +	release_firmware(fw);
> > +
> >  	return hx9023s_bin_load(data, bin);
> >  }
> >    
> 
>