linux-kernel - [PATCH 3.2 027/153] media: cpia2: Fix a couple off by one bugs

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Date:   Wed, 30 May 2018 11:52:41 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Hans Verkuil" <hans.verkuil@...co.com>,
        "Mauro Carvalho Chehab" <mchehab@...pensource.com>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.2 027/153] media: cpia2: Fix a couple off by one bugs

3.2.102-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit d5ac225c7d64c9c3ef821239edc035634e594ec9 upstream.

The cam->buffers[] array has cam->num_frames elements so the > needs to
be changed to >= to avoid going beyond the end of the array.  The
->buffers[] array is allocated in cpia2_allocate_buffers() if you want
to confirm.

Fixes: ab33d5071de7 ("V4L/DVB (3376): Add cpia2 camera support")

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/video/cpia2/cpia2_v4l.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/video/cpia2/cpia2_v4l.c
+++ b/drivers/media/video/cpia2/cpia2_v4l.c
@@ -1152,7 +1152,7 @@ static int cpia2_querybuf(struct file *f
 	struct camera_data *cam = video_drvdata(file);
 
 	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
-	   buf->index > cam->num_frames)
+	   buf->index >= cam->num_frames)
 		return -EINVAL;
 
 	buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
@@ -1201,7 +1201,7 @@ static int cpia2_qbuf(struct file *file,
 
 	if(buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
 	   buf->memory != V4L2_MEMORY_MMAP ||
-	   buf->index > cam->num_frames)
+	   buf->index >= cam->num_frames)
 		return -EINVAL;
 
 	DBG("QBUF #%d\n", buf->index);