From: Dan Carpenter <dan.carpenter@oracle.com>
To: shaojie.dong@isrc.iscas.ac.cn
Cc: Larry.Finger@lwfinger.net, florian.c.schilhabel@googlemail.com,
gregkh@linuxfoundation.org, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: rtl8712: check register_netdev() return value
Date: Wed, 9 Dec 2020 20:46:15 +0300 [thread overview]
Message-ID: <20201209174615.GI2767@kadam> (raw)
In-Reply-To: <20201209150124.23446-1-shaojie.dong@isrc.iscas.ac.cn>
On Wed, Dec 09, 2020 at 11:01:24PM +0800, shaojie.dong@isrc.iscas.ac.cn wrote:
> From: "shaojie.dong" <shaojie.dong@isrc.iscas.ac.cn>
>
> Function register_netdev() can fail, so we should check it's return value
>
> Signed-off-by: shaojie.dong <shaojie.dong@isrc.iscas.ac.cn>
> ---
> drivers/staging/rtl8712/hal_init.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/rtl8712/hal_init.c b/drivers/staging/rtl8712/hal_init.c
> index 715f1fe8b..38a3e3d44 100644
> --- a/drivers/staging/rtl8712/hal_init.c
> +++ b/drivers/staging/rtl8712/hal_init.c
> @@ -45,7 +45,10 @@ static void rtl871x_load_fw_cb(const struct firmware *firmware, void *context)
> }
> adapter->fw = firmware;
> /* firmware available - start netdev */
> - register_netdev(adapter->pnetdev);
> + if (register_netdev(adapter->pnetdev) != 0) {
> + netdev_err(adapter->pnetdev, "register_netdev() failed\n");
> + free_netdev(adapter->pnetdev);
> + }
This function should not be calling register_netdev(). What does that
have to do with firmware? It should also not free_netdev() because
that will just lead to a use after free in the caller.
regards,
dan carpenter
> complete(&adapter->rtl8712_fw_ready);
> }
>
> --
> 2.17.1
>
> _______________________________________________
> devel mailing list
> devel@linuxdriverproject.org
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
next prev parent reply other threads:[~2020-12-09 17:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 15:01 [PATCH] staging: rtl8712: check register_netdev() return value shaojie.dong
2020-12-09 15:13 ` Greg KH
2020-12-10 15:15 ` shaojie.dong
2020-12-09 17:46 ` Dan Carpenter [this message]
2020-12-10 15:05 ` shaojie.dong
2020-12-10 15:16 ` Dan Carpenter
2020-12-10 15:21 ` shaojie.dong
-- strict thread matches above, loose matches on Subject: below --
2020-12-06 15:59 shaojie.dong
2020-12-06 16:03 ` Greg KH
2020-12-06 17:10 ` kernel test robot
2020-12-06 17:10 ` kernel test robot
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