linux-kernel - Re: [PATCH] mcb: fix error handling in mcb_alloc

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Date:   Fri, 6 Aug 2021 16:32:40 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Johannes Thumshirn <jth@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Werner <andreas.werner@....de>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mcb: fix error handling in mcb_alloc_bus()

On Tue, Jun 01, 2021 at 03:23:55PM +0200, Johannes Thumshirn wrote:
> 
> 
> Am 01.06.21 um 11:18 schrieb Dan Carpenter:
> > There are two bugs:
> > 1) If ida_simple_get() fails then this code calls put_device(carrier)
> >    but we haven't yet called get_device(carrier) and probably that
> >    leads to a use after free.
> > 2) After device_initialize() then we need to use put_device() to
> >    release the bus.  This will free the internal resources tied to the
> >    device and call mcb_free_bus() which will free the rest.
> >
> > Fixes: 5d9e2ab9fea4 ("mcb: Implement bus->dev.release callback")
> > Fixes: 18d288198099 ("mcb: Correctly initialize the bus's device")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> >
> 
> Thanks applied

I don't think this was actually applied and that's a good thing because
my patch wasn't correct.  It needs to call device_put() on both
carrier and &bus->dev.

I'm going to send a v2 fix for this.

regards,
dan carpenter