Ertuğrul Erata
58 lines
2.2 KiB
Diff
58 lines
2.2 KiB
Diff
From 83934b75c368f529d084815c463a7ef781dc9751 Mon Sep 17 00:00:00 2001
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From: Sakari Ailus <sakari.ailus@linux.intel.com>
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Date: Sun, 3 Apr 2016 16:31:03 -0300
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Subject: [PATCH] [media] videobuf2-v4l2: Verify planes array in buffer
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dequeueing
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When a buffer is being dequeued using VIDIOC_DQBUF IOCTL, the exact buffer
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which will be dequeued is not known until the buffer has been removed from
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the queue. The number of planes is specific to a buffer, not to the queue.
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This does lead to the situation where multi-plane buffers may be requested
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and queued with n planes, but VIDIOC_DQBUF IOCTL may be passed an argument
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struct with fewer planes.
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__fill_v4l2_buffer() however uses the number of planes from the dequeued
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videobuf2 buffer, overwriting kernel memory (the m.planes array allocated
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in video_usercopy() in v4l2-ioctl.c) if the user provided fewer
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planes than the dequeued buffer had. Oops!
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Fixes: b0e0e1f83de3 ("[media] media: videobuf2: Prepare to divide videobuf2")
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Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
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Cc: stable@vger.kernel.org # for v4.4 and later
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Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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---
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drivers/media/v4l2-core/videobuf2-v4l2.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c b/drivers/media/v4l2-core/videobuf2-v4l2.c
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index 0b1b8c7..7f366f1 100644
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--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
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+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
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@@ -74,6 +74,11 @@ static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer
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return 0;
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}
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+static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb)
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+{
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+ return __verify_planes_array(vb, pb);
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+}
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+
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/**
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* __verify_length() - Verify that the bytesused value for each plane fits in
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* the plane length and that the data offset doesn't exceed the bytesused value.
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@@ -437,6 +442,7 @@ static int __fill_vb2_buffer(struct vb2_buffer *vb,
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}
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static const struct vb2_buf_ops v4l2_buf_ops = {
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+ .verify_planes_array = __verify_planes_array_core,
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.fill_user_buffer = __fill_v4l2_buffer,
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.fill_vb2_buffer = __fill_vb2_buffer,
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.copy_timestamp = __copy_timestamp,
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--
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2.9.2
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