linux-kernel - Re: [PATCH] PCI: endpoint: Fix a double free in __pci_epc

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Message-ID: <20250114005737.GA2004845@rocinante>
Date: Tue, 14 Jan 2025 09:57:37 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Ma Ke <make24@...as.ac.cn>
Cc: lpieralisi@...nel.org, mani@...nel.org, kishon@...nel.org,
	bhelgaas@...gle.com, jpinto@...opsys.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] PCI: endpoint: Fix a double free in __pci_epc_create()

Hello,

> The put_device(&epc->dev) call will trigger pci_epc_release() which
> frees "epc" so the kfree(epc) on the next line is a double free.
> 
> Found by code review.
> 
> Cc: stable@...r.kernel.org
> Fixes: 5e8cb4033807 ("PCI: endpoint: Add EP core layer to enable EP controller and EP functions")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>

Which kernel release did you review?  I don't see this kfree() when looking
at the current code base per:

  https://elixir.bootlin.com/linux/v6.13-rc1/source/drivers/pci/endpoint/pci-epc-core.c#L956-L1020

	Krzysztof