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

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Message-ID: <c4cffc84-be11-6558-60aa-a5217963b1f6@kernel.org>
Date:   Tue, 1 Jun 2021 15:23:55 +0200
From:   Johannes Thumshirn <jth@...nel.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
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()



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