From: David Miller <davem@davemloft.net>
To: Vadim.Lomovtsev@caviumnetworks.com
Cc: rric@kernel.org, sgoutham@cavium.com,
linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, dnelson@redhat.com,
Vadim.Lomovtsev@cavium.com
Subject: Re: [PATCH] net: thunderx: prevent concurrent data re-writing by nicvf_set_rx_mode
Date: Sun, 10 Jun 2018 12:35:51 -0700 (PDT) [thread overview]
Message-ID: <20180610.123551.885190586229525170.davem@davemloft.net> (raw)
In-Reply-To: <20180608092759.28059-1-Vadim.Lomovtsev@caviumnetworks.com>
From: Vadim Lomovtsev <Vadim.Lomovtsev@caviumnetworks.com>
Date: Fri, 8 Jun 2018 02:27:59 -0700
> + /* Save message data locally to prevent them from
> + * being overwritten by next ndo_set_rx_mode call().
> + */
> + spin_lock(&nic->rx_mode_wq_lock);
> + mode = vf_work->mode;
> + mc = vf_work->mc;
> + vf_work->mc = NULL;
> + spin_unlock(&nic->rx_mode_wq_lock);
At the moment you drop this lock, the memory behind 'mc' can be
freed up by:
> + spin_lock(&nic->rx_mode_wq_lock);
> + kfree(nic->rx_mode_work.mc);
And you'll crash when you dereference it above via
__nicvf_set_rx_mode_task().
next prev parent reply other threads:[~2018-06-10 19:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-08 9:27 [PATCH] net: thunderx: prevent concurrent data re-writing by nicvf_set_rx_mode Vadim Lomovtsev
2018-06-10 19:35 ` David Miller [this message]
2018-06-11 11:22 ` Dean Nelson
2018-06-12 22:25 ` David Miller
2018-06-13 9:15 ` Vadim Lomovtsev
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