From: Arnd Bergmann <arnd@arndb.de>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
driverdevel <devel@driverdev.osuosl.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Marcelo Diop-Gonzalez <marcgonzalez@google.com>,
kernel-janitors@vger.kernel.org,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
"moderated list:BROADCOM BCM2835 ARM ARCHITECTURE"
<linux-rpi-kernel@lists.infradead.org>,
Jamal Shareef <jamal.k.shareef@gmail.com>,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: Re: [PATCH] staging: vchiq: silence an uninitialized variable warning
Date: Wed, 30 Sep 2020 12:22:37 +0200 [thread overview]
Message-ID: <CAK8P3a1m3kaGK17A2ADgA7b9i7GeEYhX=xVoU=Yet8_T93Q2JA@mail.gmail.com> (raw)
In-Reply-To: <20200930090238.GA621698@mwanda>
On Wed, Sep 30, 2020 at 11:02 AM Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
> Smatch complains that "userdata" can be passed to vchiq_bulk_transfer()
> without being initialized. Smatch is correct, however, in that
> situation the "userdata" is not used so it doesn't cause a problem.
> Passing an uninitialized variable will trigger a UBSan warning at
> runtime so this warning is worth silencing by setting "userdata" to
> NULL.
>
> Fixes: a4367cd2b231 ("staging: vchiq: convert compat bulk transfer")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
The change looks fine, but I wonder if it's actually worse and the
uninitialized pointer can end up getting copied back to user space
in the completion.
In either case, thanks for the fix!
Acked-by: Arnd Bergmann <arnd@arndb.de>
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next prev parent reply other threads:[~2020-09-30 10:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 9:02 [PATCH] staging: vchiq: silence an uninitialized variable warning Dan Carpenter
2020-09-30 10:22 ` Arnd Bergmann [this message]
2020-09-30 12:27 ` Dan Carpenter
2020-09-30 12:30 ` [PATCH v2] staging: vchiq: Fix an uninitialized variable Dan Carpenter
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