From: Oliver Neukum <oneukum@suse.com>
To: Himadri Pandya <himadrispandya@gmail.com>,
davem@davemloft.net, kuba@kernel.org,
pankaj.laxminarayan.bharadiya@intel.com, keescook@chromium.org,
yuehaibing@huawei.com, petkan@nucleusys.com, ogiannou@gmail.com
Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org,
linux-kernel-mentees@lists.linuxfoundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH 3/4] net: usb: rtl8150: use usb_control_msg_recv() and usb_control_msg_send()
Date: Wed, 23 Sep 2020 12:22:37 +0200 [thread overview]
Message-ID: <1600856557.26851.6.camel@suse.com> (raw)
In-Reply-To: <20200923090519.361-4-himadrispandya@gmail.com>
Am Mittwoch, den 23.09.2020, 14:35 +0530 schrieb Himadri Pandya:
Hi,
> Many usage of usb_control_msg() do not have proper error check on return
> value leaving scope for bugs on short reads. New usb_control_msg_recv()
> and usb_control_msg_send() nicely wraps usb_control_msg() with proper
> error check. Hence use the wrappers instead of calling usb_control_msg()
> directly.
>
> Signed-off-by: Himadri Pandya <himadrispandya@gmail.com>
Nacked-by: Oliver Neukum <oneukum@suse.com>
> ---
> drivers/net/usb/rtl8150.c | 32 ++++++--------------------------
> 1 file changed, 6 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
> index 733f120c852b..e3002b675921 100644
> --- a/drivers/net/usb/rtl8150.c
> +++ b/drivers/net/usb/rtl8150.c
> @@ -152,36 +152,16 @@ static const char driver_name [] = "rtl8150";
> */
> static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
> {
> - void *buf;
> - int ret;
> -
> - buf = kmalloc(size, GFP_NOIO);
GFP_NOIO is used here for a reason. You need to use this helper
while in contexts of error recovery and runtime PM.
> - if (!buf)
> - return -ENOMEM;
> -
> - ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
> - RTL8150_REQ_GET_REGS, RTL8150_REQT_READ,
> - indx, 0, buf, size, 500);
> - if (ret > 0 && ret <= size)
> - memcpy(data, buf, ret);
> - kfree(buf);
> - return ret;
> + return usb_control_msg_recv(dev->udev, 0, RTL8150_REQ_GET_REGS,
> + RTL8150_REQT_READ, indx, 0, data,
> + size, 500);
This internally uses kmemdup() with GFP_KERNEL.
You cannot make this change. The API does not support it.
I am afraid we will have to change the API first, before more
such changes are done.
I would suggest dropping the whole series for now.
Regards
Oliver
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next prev parent reply other threads:[~2020-09-23 10:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 9:05 [Linux-kernel-mentees] [PATCH 0/4] net: usb: avoid using usb_control_msg() directly Himadri Pandya
2020-09-23 9:05 ` [Linux-kernel-mentees] [PATCH 1/4] net: usbnet: use usb_control_msg_recv() and usb_control_msg_send() Himadri Pandya
2020-09-23 10:24 ` Greg KH
2020-09-23 14:08 ` Himadri Pandya
2020-09-23 9:05 ` [Linux-kernel-mentees] [PATCH 2/4] net: sierra_net: use usb_control_msg_recv() Himadri Pandya
2020-09-23 9:05 ` [Linux-kernel-mentees] [PATCH 3/4] net: usb: rtl8150: use usb_control_msg_recv() and usb_control_msg_send() Himadri Pandya
2020-09-23 10:22 ` Oliver Neukum [this message]
2020-09-23 14:06 ` Himadri Pandya
2020-09-23 14:20 ` Oliver Neukum
2020-09-23 14:32 ` Himadri Pandya
2020-09-24 11:13 ` Oliver Neukum
2020-09-25 11:23 ` Himadri Pandya
2020-09-23 14:48 ` Petko Manolov
2020-09-24 11:09 ` Oliver Neukum
2020-09-24 15:40 ` Petko Manolov
2020-09-24 16:01 ` Greg KH
2020-09-23 9:05 ` [Linux-kernel-mentees] [PATCH 4/4] net: rndis_host: " Himadri Pandya
2020-09-23 10:22 ` Greg KH
2020-09-23 14:14 ` Himadri Pandya
2020-09-23 10:23 ` [Linux-kernel-mentees] [PATCH 0/4] net: usb: avoid using usb_control_msg() directly Greg KH
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