linux-kernel - [PATCH 4.9 61/83] media: uvcvideo: Fix uvc_alloc

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Message-Id: <20190609164133.056739483@linuxfoundation.org>
Date:   Sun,  9 Jun 2019 18:42:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nadav Amit <namit@...are.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Doug Anderson <dianders@...omium.org>,
        Ben Hutchings <ben@...adent.org.uk>
Subject: [PATCH 4.9 61/83] media: uvcvideo: Fix uvc_alloc_entity() allocation alignment

From: Nadav Amit <namit@...are.com>

commit 89dd34caf73e28018c58cd193751e41b1f8bdc56 upstream.

The use of ALIGN() in uvc_alloc_entity() is incorrect, since the size of
(entity->pads) is not a power of two. As a stop-gap, until a better
solution is adapted, use roundup() instead.

Found by a static assertion. Compile-tested only.

Fixes: 4ffc2d89f38a ("uvcvideo: Register subdevices for each entity")

Signed-off-by: Nadav Amit <namit@...are.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc: Doug Anderson <dianders@...omium.org>
Cc: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/usb/uvc/uvc_driver.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -868,7 +868,7 @@ static struct uvc_entity *uvc_alloc_enti
 	unsigned int size;
 	unsigned int i;
 
-	extra_size = ALIGN(extra_size, sizeof(*entity->pads));
+	extra_size = roundup(extra_size, sizeof(*entity->pads));
 	num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1;
 	size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
 	     + num_inputs;