linux-kernel - Re: [PATCH 5.10 01/63] net/sched: sch_taprio: reset child qdiscs before freeing them

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Date:   Mon, 4 Jan 2021 17:58:27 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        syzbot+8971da381fb5a31f542d@...kaller.appspotmail.com,
        Davide Caratti <dcaratti@...hat.com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 5.10 01/63] net/sched: sch_taprio: reset child qdiscs
 before freeing them

On Mon, Jan 04, 2021 at 04:56:54PM +0100, Greg Kroah-Hartman wrote:
>From: Davide Caratti <dcaratti@...hat.com>
>
>[ Upstream commit 44d4775ca51805b376a8db5b34f650434a08e556 ]
>
>syzkaller shows that packets can still be dequeued while taprio_destroy()
>is running. Let sch_taprio use the reset() function to cancel the advance
>timer and drop all skbs from the child qdiscs.
>
>Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")
>Link: https://syzkaller.appspot.com/bug?id=f362872379bf8f0017fb667c1ab158f2d1e764ae
>Reported-by: syzbot+8971da381fb5a31f542d@...kaller.appspotmail.com
>Signed-off-by: Davide Caratti <dcaratti@...hat.com>
>Acked-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
>Link: https://lore.kernel.org/r/63b6d79b0e830ebb0283e020db4df3cdfdfb2b94.1608142843.git.dcaratti@redhat.com
>Signed-off-by: Jakub Kicinski <kuba@...nel.org>
>Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

I noticed that there's a fix for this patch going through netdev (but
not yet in Linus's tree). The fix reads to me like it fixes a missed
corner case by this patch rather than this patch being incorrect, so
I'll leave this patch in. If anyone disagrees please speak up :)

-- 
Thanks,
Sasha