linux-kernel - Re: [PATCH] net: brcmfmac: fix potential resource leak in brcmf_usb_probe

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Message-ID: <874jtnjulu.fsf@kernel.org>
Date:   Thu, 22 Dec 2022 18:01:17 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Jianglei Nie <niejianglei2021@....com>
Cc:     aspriel@...il.com, franky.lin@...adcom.com,
        hante.meuleman@...adcom.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        alsi@...g-olufsen.dk, rmk+kernel@...linux.org.uk,
        linus.walleij@...aro.org, marcan@...can.st,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: brcmfmac: fix potential resource leak in brcmf_usb_probe_phase2()

Jianglei Nie <niejianglei2021@....com> writes:

> brcmf_usb_probe_phase2() allocates resource for dev with brcmf_alloc().
> The related resource should be released when the function gets some error.
> But when brcmf_attach() fails, relevant resource is not released, which
> will lead to resource leak.
>
> Fix it by calling brcmf_free() when brcmf_attach() fails.
>
> Signed-off-by: Jianglei Nie <niejianglei2021@....com>
> ---
>  drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
> index 85e18fb9c497..5d8c12b2c4d7 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c
> @@ -1215,6 +1215,7 @@ static void brcmf_usb_probe_phase2(struct device *dev, int ret,
>  	return;
>  error:
>  	brcmf_dbg(TRACE, "failed: dev=%s, err=%d\n", dev_name(dev), ret);
> +	brcmf_free(devinfo->dev);
>  	complete(&devinfo->dev_init_done);
>  	device_release_driver(dev);
>  }

This doesn't look right. Now we would call brfmf_free() even before
brcmf_alloc() is called.

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