From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Alexandru Ardelean <ardeleanalex@gmail.com>
Cc: "Alexandru Ardelean" <alexandru.ardelean@analog.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-iio <linux-iio@vger.kernel.org>,
"Lars-Peter Clausen" <lars@metafoo.de>,
"Michael Hennerich" <Michael.Hennerich@analog.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"Nuno Sá" <nuno.sa@analog.com>,
"Bogdan, Dragos" <dragos.bogdan@analog.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v3 06/11] iio: core: merge buffer/ & scan_elements/ attributes
Date: Fri, 5 Feb 2021 13:07:59 +0200 [thread overview]
Message-ID: <CAHp75Vd1kx63WPOYb0KsSCHvazEv8=7-qcn3E+QBmdRBrztpMw@mail.gmail.com> (raw)
In-Reply-To: <CA+U=Dso4zosunKgqb64+EwepUwcrpJN0ANwvFXnsz5KxVhOG-w@mail.gmail.com>
On Thu, Feb 4, 2021 at 3:41 PM Alexandru Ardelean
<ardeleanalex@gmail.com> wrote:
> On Wed, Feb 3, 2021 at 12:04 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > On Mon, Feb 1, 2021 at 5:28 PM Alexandru Ardelean
> > <alexandru.ardelean@analog.com> wrote:
...
> > > + group->attrs = kcalloc(buffer_attrcount + 1,
> > > + sizeof(struct attribute *), GFP_KERNEL);
> > > + if (!group->attrs)
> > > + return -ENOMEM;
> > > +
> > > + memcpy(group->attrs, buffer_attrs,
> > > + buffer_attrcount * sizeof(struct attribute *));
> >
> > kmemdup() ?
> > Perhaps introduce kmemdup_array().
>
> doesn't add much benefit from what i can tell;
> and it complicates things with the fact that we need to add the extra
> null terminator element;
> [1] if we kmemdup(buffer_attrcount + 1) , the copy an extra element we
> don't need, which needs to be null-ed
Ah, I see now. Thanks for pointing it out!
> > > + group->attrs = kcalloc(scan_el_attrcount + 1,
> > > + sizeof(struct attribute *), GFP_KERNEL);
> > > + if (!group->attrs) {
> > > + ret = -ENOMEM;
> > > + goto error_free_buffer_attrs;
> > > + }
> > > +
> > > + memcpy(group->attrs, &buffer_attrs[buffer_attrcount],
> > > + scan_el_attrcount * sizeof(struct attribute *));
> >
> > Ditto.
>
> continuing from [1]
> here it may be worse, because kmemdup() would copy 1 element from
> undefined memory;
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-02-05 11:39 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 14:50 [PATCH v3 00/11] iio: core,buffer: add support for multiple IIO buffers per IIO device Alexandru Ardelean
2021-02-01 14:50 ` [PATCH v3 01/11] docs: ioctl-number.rst: reserve IIO subsystem ioctl() space Alexandru Ardelean
2021-02-04 17:06 ` Jonathan Cameron
2021-02-05 7:08 ` Alexandru Ardelean
2021-02-01 14:50 ` [PATCH v3 02/11] iio: core: register chardev only if needed Alexandru Ardelean
2021-02-04 17:17 ` Jonathan Cameron
2021-02-01 14:50 ` [PATCH v3 03/11] iio: core-trigger: make iio_device_register_trigger_consumer() an int return Alexandru Ardelean
2021-02-01 14:50 ` [PATCH v3 04/11] iio: core: rework iio device group creation Alexandru Ardelean
2021-02-04 17:32 ` Jonathan Cameron
2021-02-05 7:32 ` Alexandru Ardelean
2021-02-01 14:50 ` [PATCH v3 05/11] iio: buffer: group attr count and attr alloc Alexandru Ardelean
2021-02-04 17:49 ` Jonathan Cameron
2021-02-05 8:12 ` Alexandru Ardelean
2021-02-05 12:33 ` Jonathan Cameron
2021-02-01 14:51 ` [PATCH v3 06/11] iio: core: merge buffer/ & scan_elements/ attributes Alexandru Ardelean
2021-02-01 20:02 ` kernel test robot
2021-02-02 6:07 ` Dan Carpenter
2021-02-03 10:02 ` Andy Shevchenko
2021-02-04 13:41 ` Alexandru Ardelean
2021-02-05 11:07 ` Andy Shevchenko [this message]
2021-02-01 14:51 ` [PATCH v3 07/11] iio: add reference to iio buffer on iio_dev_attr Alexandru Ardelean
2021-02-04 18:09 ` Jonathan Cameron
2021-02-05 8:26 ` Alexandru Ardelean
2021-02-01 14:51 ` [PATCH v3 08/11] iio: buffer: wrap all buffer attributes into iio_dev_attr Alexandru Ardelean
2021-02-04 18:23 ` Jonathan Cameron
2021-02-05 9:17 ` Alexandru Ardelean
2021-02-05 12:39 ` Jonathan Cameron
2021-02-05 12:57 ` Alexandru Ardelean
2021-02-06 14:46 ` Jonathan Cameron
2021-02-01 14:51 ` [PATCH v3 09/11] iio: core: wrap iio device & buffer into struct for character devices Alexandru Ardelean
2021-02-01 14:51 ` [PATCH v3 10/11] iio: buffer: introduce support for attaching more IIO buffers Alexandru Ardelean
2021-02-04 18:34 ` Jonathan Cameron
2021-02-05 9:32 ` Alexandru Ardelean
2021-02-01 14:51 ` [PATCH v3 11/11] iio: buffer: add ioctl() to support opening extra buffers for IIO device Alexandru Ardelean
2021-02-04 19:00 ` Jonathan Cameron
2021-02-05 9:51 ` Alexandru Ardelean
2021-02-05 12:44 ` Jonathan Cameron
2021-02-05 12:48 ` Alexandru Ardelean
2021-02-06 14:48 ` Jonathan Cameron
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