linux-kernel - Re: [PATCH v2 wireless-drivers 1/2] libertas_tf: Fix possible memory leak in probe and disconnect

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Date:   Wed, 27 Oct 2021 07:32:41 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Wang Hai <wanghai38@...wei.com>
Cc:     <briannorris@...omium.org>, <davem@...emloft.net>,
        <kuba@...nel.org>, <shenyang39@...wei.com>, <marcelo@...ck.org>,
        <linville@...driver.com>, <luisca@...ybit.com>,
        <libertas-dev@...ts.infradead.org>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 wireless-drivers 1/2] libertas_tf: Fix possible memory
 leak
 in probe and disconnect

Wang Hai <wanghai38@...wei.com> wrote:

> I got memory leak as follows when doing fault injection test:
> 
> unreferenced object 0xffff88810a2ddc00 (size 512):
>   comm "kworker/6:1", pid 176, jiffies 4295009893 (age 757.220s)
>   hex dump (first 32 bytes):
>     00 50 05 18 81 88 ff ff 00 00 00 00 00 00 00 00  .P..............
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff8167939c>] slab_post_alloc_hook+0x9c/0x490
>     [<ffffffff8167f627>] kmem_cache_alloc_trace+0x1f7/0x470
>     [<ffffffffa02a1530>] if_usb_probe+0x60/0x37c [libertas_tf_usb]
>     [<ffffffffa022668a>] usb_probe_interface+0x1aa/0x3c0 [usbcore]
>     [<ffffffff82b59630>] really_probe+0x190/0x480
>     [<ffffffff82b59a19>] __driver_probe_device+0xf9/0x180
>     [<ffffffff82b59af3>] driver_probe_device+0x53/0x130
>     [<ffffffff82b5a075>] __device_attach_driver+0x105/0x130
>     [<ffffffff82b55949>] bus_for_each_drv+0x129/0x190
>     [<ffffffff82b593c9>] __device_attach+0x1c9/0x270
>     [<ffffffff82b5a250>] device_initial_probe+0x20/0x30
>     [<ffffffff82b579c2>] bus_probe_device+0x142/0x160
>     [<ffffffff82b52e49>] device_add+0x829/0x1300
>     [<ffffffffa02229b1>] usb_set_configuration+0xb01/0xcc0 [usbcore]
>     [<ffffffffa0235c4e>] usb_generic_driver_probe+0x6e/0x90 [usbcore]
>     [<ffffffffa022641f>] usb_probe_device+0x6f/0x130 [usbcore]
> 
> cardp is missing being freed in the error handling path of the probe
> and the path of the disconnect, which will cause memory leak.
> 
> This patch adds the missing kfree().
> 
> Fixes: c305a19a0d0a ("libertas_tf: usb specific functions")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Wang Hai <wanghai38@...wei.com>

2 patches applied to wireless-drivers-next.git, thanks.

d549107305b4 libertas_tf: Fix possible memory leak in probe and disconnect
9692151e2fe7 libertas: Fix possible memory leak in probe and disconnect

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20211020120345.2016045-2-wanghai38@huawei.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches