linux-kernel - RE: [PATCH net v2] net: stmmac: Fix accessing freed irq affinity

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Message-ID: <CO1PR11MB50891366B8997C225707C519D6DE2@CO1PR11MB5089.namprd11.prod.outlook.com>
Date: Tue, 18 Mar 2025 23:08:06 +0000
From: "Keller, Jacob E" <jacob.e.keller@...el.com>
To: Qingfang Deng <dqfext@...il.com>, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>, "Dumazet, Eric"
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, "Alexandre
 Torgue" <alexandre.torgue@...s.st.com>, "Ong, Boon Leong"
	<boon.leong.ong@...el.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH net v2] net: stmmac: Fix accessing freed irq affinity_hint



> -----Original Message-----
> From: Qingfang Deng <dqfext@...il.com>
> Sent: Monday, March 17, 2025 8:24 PM
> To: Andrew Lunn <andrew+netdev@...n.ch>; David S. Miller
> <davem@...emloft.net>; Dumazet, Eric <edumazet@...gle.com>; Jakub Kicinski
> <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Maxime Coquelin
> <mcoquelin.stm32@...il.com>; Alexandre Torgue
> <alexandre.torgue@...s.st.com>; Ong, Boon Leong
> <boon.leong.ong@...el.com>; netdev@...r.kernel.org; linux-stm32@...md-
> mailman.stormreply.com; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org
> Cc: stable@...r.kernel.org
> Subject: [PATCH net v2] net: stmmac: Fix accessing freed irq affinity_hint
> 
> The cpumask should not be a local variable, since its pointer is saved
> to irq_desc and may be accessed from procfs.
> To fix it, use the persistent mask cpumask_of(cpu#).
> 
> Cc: stable@...r.kernel.org
> Fixes: 8deec94c6040 ("net: stmmac: set IRQ affinity hint for multi MSI vectors")
> Signed-off-by: Qingfang Deng <dqfext@...il.com>
> ---
> v2: use cpumask_of()
> 

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>