linux-kernel - [PATCH 0/1] wifi: ath9k: hif_usb: fix memory leak of remain

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Message-Id: <20230212145238.123055-1-pchelkin@ispras.ru>
Date:   Sun, 12 Feb 2023 17:52:37 +0300
From:   Fedor Pchelkin <pchelkin@...ras.ru>
To:     Toke Høiland-Jørgensen <toke@...e.dk>
Cc:     Fedor Pchelkin <pchelkin@...ras.ru>, 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>,
        "John W. Linville" <linville@...driver.com>,
        Vasanthakumar Thiagarajan <vasanth@...eros.com>,
        Senthil Balasubramanian <senthilkumar@...eros.com>,
        Sujith <Sujith.Manoharan@...eros.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org
Subject: [PATCH 0/1] wifi: ath9k: hif_usb: fix memory leak of remain_skbs

Hello,

the problem is described in the following patch.

Some remarks:
I'm not quite sure if the function proposed in the patch should be placed
somewhere else in the code... The patch now calls it during device
deinitialization after urbs deallocation, and I suppose the interrupt
callback ath9k_hif_usb_rx_stream() not to be executed during/after that
period (in this case the leak would still remain, but I couldn't reproduce
this particular case). Maybe the function freeing remain_skbs should be
placed right before calling 'kfree(hif_dev)'?

The patch is made on top of [1] master branch.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/

---
Regards,

Fedor