From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Oliver O'Halloran <oohall@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Oliver O'Halloran <oohall@gmail.com>
Subject: Re: [PATCH 1/2] cpufreq/powernv: Fix use-after-free
Date: Wed, 18 Mar 2020 00:14:40 +1100 (AEDT) [thread overview]
Message-ID: <48hYYG1y3Lz9sSL@ozlabs.org> (raw)
In-Reply-To: <20200206062622.28235-1-oohall@gmail.com>
On Thu, 2020-02-06 at 06:26:21 UTC, Oliver O'Halloran wrote:
> The cpufreq driver has a use-after-free that we can hit if:
>
> a) There's an OCC message pending when the notifier is registered, and
> b) The cpufreq driver fails to register with the core.
>
> When a) occurs the notifier schedules a workqueue item to handle the
> message. The backing work_struct is located on chips[].throttle and when b)
> happens we clean up by freeing the array. Once we get to the (now free)
> queued item and the kernel crashes.
>
> Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
> Fixes: c5e29ea ("cpufreq: powernv: Fix bugs in powernv_cpufreq_{init/exit}")
> Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Series applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/d0a72efac89d1c35ac55197895201b7b94c5e6ef
cheers
prev parent reply other threads:[~2020-03-17 13:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-06 6:26 [PATCH 1/2] cpufreq/powernv: Fix use-after-free Oliver O'Halloran
2020-02-06 6:26 ` [PATCH 2/2] cpufreq/powernv: Fix unsafe notifiers Oliver O'Halloran
2020-02-25 6:45 ` Gautham R Shenoy
2020-02-25 6:42 ` [PATCH 1/2] cpufreq/powernv: Fix use-after-free Gautham R Shenoy
2020-02-25 7:03 ` Andrew Donnellan
2020-02-27 1:31 ` Michael Ellerman
2020-03-17 13:14 ` Michael Ellerman [this message]
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