netdev - RE: [PATCH v2] wifi: rtw88: fix memory leak in rtw_usb

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Message-ID: <ce838586b8ea42b6a87a2e523d6db54b@realtek.com>
Date:   Thu, 9 Mar 2023 03:55:46 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Dongliang Mu <dzm91@...t.edu.cn>
CC:     Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] wifi: rtw88: fix memory leak in rtw_usb_probe()



> -----Original Message-----
> From: Dongliang Mu <dzm91@...t.edu.cn>
> Sent: Thursday, March 9, 2023 11:53 AM
> To: Ping-Ke Shih <pkshih@...ltek.com>
> Cc: Yan-Hsuan Chuang <tony0620emma@...il.com>; Kalle Valo <kvalo@...nel.org>; David S. Miller
> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni
> <pabeni@...hat.com>; linux-wireless@...r.kernel.org; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2] wifi: rtw88: fix memory leak in rtw_usb_probe()
> 
> > On Mar 9, 2023, at 11:47, Ping-Ke Shih <pkshih@...ltek.com> wrote:
> >
> >
> >
> >> -----Original Message-----
> >> From: Dongliang Mu <dzm91@...t.edu.cn>
> >> Sent: Thursday, March 9, 2023 10:17 AM
> >> To: Yan-Hsuan Chuang <tony0620emma@...il.com>; Kalle Valo <kvalo@...nel.org>; David S. Miller
> >> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo
> Abeni
> >> <pabeni@...hat.com>
> >> Cc: Dongliang Mu <dzm91@...t.edu.cn>; linux-wireless@...r.kernel.org; netdev@...r.kernel.org;
> >> linux-kernel@...r.kernel.org
> >> Subject: [PATCH v2] wifi: rtw88: fix memory leak in rtw_usb_probe()
> >>
> >> drivers/net/wireless/realtek/rtw88/usb.c:876 rtw_usb_probe()
> >> warn: 'hw' from ieee80211_alloc_hw() not released on lines: 811
> >
> > Can I know which tool can detect this? It would be good to mention the tool
> > in commit message.
> >
> 
> Oh, Smatch, I forget to mention it.

Thanks. It seems like my smatch is too old.

> 
> >>
> >> Fix this by modifying return to a goto statement.
> >>
> >> Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
> >> ---
> >> v1->v2: modify the commit title
> >> drivers/net/wireless/realtek/rtw88/usb.c | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
> >> index 2a8336b1847a..68e1b782d199 100644
> >> --- a/drivers/net/wireless/realtek/rtw88/usb.c
> >> +++ b/drivers/net/wireless/realtek/rtw88/usb.c
> >> @@ -808,7 +808,7 @@ int rtw_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
> >>
> >>        ret = rtw_usb_alloc_rx_bufs(rtwusb);
> >>        if (ret)
> >> -               return ret;
> >> +               goto err_release_hw;
> >>
> >>        ret = rtw_core_init(rtwdev);
> >>        if (ret)
> >> --
> >> 2.39.2
> 
> 
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