mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 17:18:59 +00:00
54 lines
2.1 KiB
Diff
54 lines
2.1 KiB
Diff
|
From 2d8ae9f2f45a2f5b777088cbab6e5ea15744d1d5 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Sakari Ailus <sakari.ailus@linux.intel.com>
|
||
|
|
Date: Sun, 3 Apr 2016 16:31:03 -0300
|
||
|
|
Subject: [PATCH 320/381] videobuf2-v4l2: Verify planes array in buffer
|
||
|
|
dequeueing
|
||
|
|
|
||
|
|
commit 2c1f6951a8a82e6de0d82b1158b5e493fc6c54ab upstream.
|
||
|
|
|
||
|
|
When a buffer is being dequeued using VIDIOC_DQBUF IOCTL, the exact buffer
|
||
|
|
which will be dequeued is not known until the buffer has been removed from
|
||
|
|
the queue. The number of planes is specific to a buffer, not to the queue.
|
||
|
|
|
||
|
|
This does lead to the situation where multi-plane buffers may be requested
|
||
|
|
and queued with n planes, but VIDIOC_DQBUF IOCTL may be passed an argument
|
||
|
|
struct with fewer planes.
|
||
|
|
|
||
|
|
__fill_v4l2_buffer() however uses the number of planes from the dequeued
|
||
|
|
videobuf2 buffer, overwriting kernel memory (the m.planes array allocated
|
||
|
|
in video_usercopy() in v4l2-ioctl.c) if the user provided fewer
|
||
|
|
planes than the dequeued buffer had. Oops!
|
||
|
|
|
||
|
|
Fixes: b0e0e1f83de3 ("[media] media: videobuf2: Prepare to divide videobuf2")
|
||
|
|
|
||
|
|
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
|
||
|
|
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
|
||
|
|
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
|
||
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
||
|
|
---
|
||
|
|
drivers/media/v4l2-core/videobuf2-v4l2.c | 6 ++++++
|
||
|
|
1 file changed, 6 insertions(+)
|
||
|
|
|
||
|
|
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
|
||
|
|
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
|
||
|
|
@@ -67,6 +67,11 @@ static int __verify_planes_array(struct
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
+static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb)
|
||
|
|
+{
|
||
|
|
+ return __verify_planes_array(vb, pb);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
/**
|
||
|
|
* __verify_length() - Verify that the bytesused value for each plane fits in
|
||
|
|
* the plane length and that the data offset doesn't exceed the bytesused value.
|
||
|
|
@@ -432,6 +437,7 @@ static int __fill_vb2_buffer(struct vb2_
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct vb2_buf_ops v4l2_buf_ops = {
|
||
|
|
+ .verify_planes_array = __verify_planes_array_core,
|
||
|
|
.fill_user_buffer = __fill_v4l2_buffer,
|
||
|
|
.fill_vb2_buffer = __fill_vb2_buffer,
|
||
|
|
.set_timestamp = __set_timestamp,
|