linux-kernel - Re: [PATCH] wifi: rt2x00: Fix memory leak when handling surveys

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Message-ID: <20230401104738.GA104104@wp.pl>
Date:   Sat, 1 Apr 2023 12:47:38 +0200
From:   Stanislaw Gruszka <stf_xl@...pl>
To:     Armin Wolf <W_Armin@....de>
Cc:     helmut.schaa@...glemail.com, kvalo@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: rt2x00: Fix memory leak when handling surveys

On Thu, Mar 30, 2023 at 11:56:37PM +0200, Armin Wolf wrote:
> When removing a rt2x00 device, its associated channel surveys
> are not freed, causing a memory leak observable with kmemleak:
> 
> unreferenced object 0xffff9620f0881a00 (size 512):
>   comm "systemd-udevd", pid 2290, jiffies 4294906974 (age 33.768s)
>   hex dump (first 32 bytes):
>     70 44 12 00 00 00 00 00 92 8a 00 00 00 00 00 00  pD..............
>     00 00 00 00 00 00 00 00 ab 87 01 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffffb0ed858b>] __kmalloc+0x4b/0x130
>     [<ffffffffc1b0f29b>] rt2800_probe_hw+0xc2b/0x1380 [rt2800lib]
>     [<ffffffffc1a9496e>] rt2800usb_probe_hw+0xe/0x60 [rt2800usb]
>     [<ffffffffc1ae491a>] rt2x00lib_probe_dev+0x21a/0x7d0 [rt2x00lib]
>     [<ffffffffc1b3b83e>] rt2x00usb_probe+0x1be/0x980 [rt2x00usb]
>     [<ffffffffc05981e2>] usb_probe_interface+0xe2/0x310 [usbcore]
>     [<ffffffffb13be2d5>] really_probe+0x1a5/0x410
>     [<ffffffffb13be5c8>] __driver_probe_device+0x78/0x180
>     [<ffffffffb13be6fe>] driver_probe_device+0x1e/0x90
>     [<ffffffffb13be972>] __driver_attach+0xd2/0x1c0
>     [<ffffffffb13bbc57>] bus_for_each_dev+0x77/0xd0
>     [<ffffffffb13bd2a2>] bus_add_driver+0x112/0x210
>     [<ffffffffb13bfc6c>] driver_register+0x5c/0x120
>     [<ffffffffc0596ae8>] usb_register_driver+0x88/0x150 [usbcore]
>     [<ffffffffb0c011c4>] do_one_initcall+0x44/0x220
>     [<ffffffffb0d6134c>] do_init_module+0x4c/0x220
> 
> Fix this by freeing the channel surveys on device removal.
> 
> Tested with a RT3070 based USB wireless adapter.
> 
> Fixes: 5447626910f5 ("rt2x00: save survey for every channel visited")
> Signed-off-by: Armin Wolf <W_Armin@....de>
Acked-by: Stanislaw Gruszka <stf_xl@...pl>