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Date: Tue, 25 Aug 2020 10:39:46 -0400 From: Alan Stern <stern@...land.harvard.edu> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Dmitry Vyukov <dvyukov@...gle.com>, Himadri Pandya <himadrispandya@...il.com>, David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, linux-kernel-mentees@...ts.linuxfoundation.org, USB list <linux-usb@...r.kernel.org>, netdev <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, syzkaller-bugs <syzkaller-bugs@...glegroups.com> Subject: Re: [PATCH] net: usb: Fix uninit-was-stored issue in asix_read_cmd() On Tue, Aug 25, 2020 at 08:51:35AM +0200, Greg Kroah-Hartman wrote: > At first glance, I think this can all be cleaned up, but it will take a > bit of tree-wide work. I agree, we need a "read this message and error > if the whole thing is not there", as well as a "send this message and > error if the whole thing was not sent", and also a way to handle > stack-provided data, which seems to be the primary reason subsystems > wrap this call (they want to make it easier on their drivers to use it.) > > Let me think about this in more detail, but maybe something like: > usb_control_msg_read() > usb_control_msg_send() > is a good first step (as the caller knows this) and stack provided data > would be allowed, and it would return an error if the whole message was > not read/sent properly. That way we can start converting everything > over to a sane, and checkable, api and remove a bunch of wrapper > functions as well. Suggestion: _read and _send are not a natural pair. Consider instead _read and _write. _recv and _send don't feel right either, because it both cases the host sends the control message -- the difference lies in who sends the data. Alan Stern
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