From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Dave Stevenson <dave.stevenson@raspberrypi.org>,
Hans Verkuil <hans.verkuil@cisco.com>,
mchehab@kernel.org, linux-media@vger.kernel.org,
"for 4.14 and up" <stable@vger.kernel.org>
Subject: Re: [PATCH v4.4 1/1] v4l: event: Add subscription to list before calling "add" operation
Date: Mon, 26 Nov 2018 08:32:33 +0100 [thread overview]
Message-ID: <20181126073233.GD18375@kroah.com> (raw)
In-Reply-To: <20181108114632.17194-1-sakari.ailus@linux.intel.com>
On Thu, Nov 08, 2018 at 01:46:32PM +0200, Sakari Ailus wrote:
> [ upstream commit 92539d3eda2c090b382699bbb896d4b54e9bdece ]
>
> Patch ad608fbcf166 changed how events were subscribed to address an issue
> elsewhere. As a side effect of that change, the "add" callback was called
> before the event subscription was added to the list of subscribed events,
> causing the first event queued by the add callback (and possibly other
> events arriving soon afterwards) to be lost.
>
> Fix this by adding the subscription to the list before calling the "add"
> callback, and clean up afterwards if that fails.
>
> Fixes: ad608fbcf166 ("media: v4l: event: Prevent freeing event subscriptions while accessed")
>
> Reported-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
> Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
> Tested-by: Hans Verkuil <hans.verkuil@cisco.com>
> Cc: stable@vger.kernel.org (for 4.14 and up)
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
> ---
> drivers/media/v4l2-core/v4l2-event.c | 43 ++++++++++++++++++++----------------
> 1 file changed, 24 insertions(+), 19 deletions(-)
Now applied, thanks.
greg k-h
prev parent reply other threads:[~2018-11-26 18:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 11:46 [PATCH v4.4 1/1] v4l: event: Add subscription to list before calling "add" operation Sakari Ailus
2018-11-26 7:32 ` Greg Kroah-Hartman [this message]
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