linux-kernel - Re: [PATCH] media: zr364xx: fix memory leaks in probe()

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Message-ID: <20210106193116.GE2831@kadam>
Date:   Wed, 6 Jan 2021 22:31:16 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Hans Verkuil <hans.verkuil@...co.com>
Cc:     Antoine Jacquet <royale@...ezo.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: zr364xx: fix memory leaks in probe()

On Wed, Jan 06, 2021 at 11:45:50AM -0500, Alan Stern wrote:
> On Wed, Jan 06, 2021 at 01:10:05PM +0300, Dan Carpenter wrote:
> > Syzbot discovered that the probe error handling doesn't clean up the
> > resources allocated in zr364xx_board_init().  There are several
> > related bugs in this code so I have re-written the error handling.
> 
> Dan:
> 
> I recently sent in a patch for a similar problem in the gspca driver
> (commit e469d0b09a19 "media: gspca: Fix memory leak in probe").  It
> seems there may be similar issues in that driver: one single function
> call tries to undo an indeterminate number of initializations.
> 
> I don't know enough about these subsystems to evaluate this.  Can you
> take a look at it?
> 

The probe error handling in gspca_dev_probe2() is fine now.  All those
functions are no-ops when they haven't been allocated/registered.

regards,
dan carpenter