[PATCH 4.5 115/200] [media] vb2-memops: Fix over allocation of frame vectors

From: Greg Kroah-Hartman
Date: Mon May 02 2016 - 21:11:49 EST

4.5-stable review patch. If anyone has any objections, please let me know.


From: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>

commit 89a095668304e8a02502ffd35edacffdbf49aa8c upstream.

On page unaligned frames, create_framevec forces get_vaddr_frames to
allocate an extra page at the end of the buffer. Under some
circumstances, this leads to -EINVAL on VIDIOC_QBUF.

We have vm_a that vm_area that goes from 0x1000 to 0x3000. And a
frame that goes from 0x1800 to 0x2800, i.e. 2 pages.

frame_vector_create will be called with the following params:

get_vaddr_frames(0x1800, 2, write, 1, vec);

get_vaddr will allocate the first page after checking that the memory
0x1800-0x27ff is valid, but it will not allocate the second page because
the range 0x2800-0x37ff is out of the vm_a range. This results in
create_framevec returning -EFAULT

Error Trace:
[ 9083.793015] video0: VIDIOC_QBUF: 00:00:00.00000000 index=1,
type=vid-cap, flags=0x00002002, field=any, sequence=0,
memory=userptr, bytesused=0, offset/userptr=0x7ff2b023ca80, length=5765760
[ 9083.793028] timecode=00:00:00 type=0, flags=0x00000000,
frames=0, userbits=0x00000000
[ 9083.793117] video0: VIDIOC_QBUF: error -22: 00:00:00.00000000
index=2, type=vid-cap, flags=0x00000000, field=any, sequence=0,
memory=userptr, bytesused=0, offset/userptr=0x7ff2b07bc500, length=5765760

Also use true instead of 1 since that argument is a bool in the
get_vaddr_frames() prototype.

Fixes: 21fb0cb7ec65 ("[media] vb2: Provide helpers for mapping virtual addresses")

Reported-by: Albert Antony <albert@xxxxxxxxx>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
[hans.verkuil@xxxxxxxxx: merged the 'bool' change into this patch]
Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>

drivers/media/v4l2-core/videobuf2-memops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/v4l2-core/videobuf2-memops.c
+++ b/drivers/media/v4l2-core/videobuf2-memops.c
@@ -49,7 +49,7 @@ struct frame_vector *vb2_create_framevec
vec = frame_vector_create(nr);
if (!vec)
return ERR_PTR(-ENOMEM);
- ret = get_vaddr_frames(start, nr, write, 1, vec);
+ ret = get_vaddr_frames(start & PAGE_MASK, nr, write, true, vec);
if (ret < 0)
goto out_destroy;
/* We accept only complete set of PFNs */