linux-kernel - Re: [v2 PATCH 1/1] crypto: caam: fix netdev memory leak in dpaa2_caam

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Message-ID: <aXtGAS8goIlVr74K@gmail.com>
Date: Thu, 29 Jan 2026 03:35:38 -0800
From: Breno Leitao <leitao@...ian.org>
To: Jianpeng Chang <jianpeng.chang.cn@...driver.com>
Cc: horia.geanta@....com, pankaj.gupta@....com, gaurav.jain@....com, 
	herbert@...dor.apana.org.au, davem@...emloft.net, kuba@...nel.org, 
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 1/1] crypto: caam: fix netdev memory leak in
 dpaa2_caam_probe

On Tue, Jan 20, 2026 at 09:55:24AM +0800, Jianpeng Chang wrote:
> When commit 0e1a4d427f58 ("crypto: caam: Unembed net_dev structure in
> dpaa2") converted embedded net_device to dynamically allocated pointers,
> it added cleanup in dpaa2_dpseci_disable() but missed adding cleanup in
> dpaa2_dpseci_free() for error paths.
> 
> This causes memory leaks when dpaa2_dpseci_dpio_setup() fails during probe
> due to DPIO devices not being ready yet. The kernel's deferred probe
> mechanism handles the retry successfully, but the netdevs allocated during
> the failed probe attempt are never freed, resulting in kmemleak reports
> showing multiple leaked netdev-related allocations all traced back to
> dpaa2_caam_probe().
> 
> Fix this by preserving the CPU mask of allocated netdevs during setup and
> using it for cleanup in dpaa2_dpseci_free(). This approach ensures that
> only the CPUs that actually had netdevs allocated will be cleaned up,
> avoiding potential issues with CPU hotplug scenarios.
> 
> Fixes: 0e1a4d427f58 ("crypto: caam: Unembed net_dev structure in dpaa2")
> Signed-off-by: Jianpeng Chang <jianpeng.chang.cn@...driver.com>

Reviewed-by: Breno Leitao <leitao@...ian.org>