This is a note to let you know that I've just added the patch titled
[media] vb2-memops: Fix over allocation of frame vectors
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vb2-memops-fix-over-allocation-of-frame-vectors.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 89a095668304e8a02502ffd35edacffdbf49aa8c Mon Sep 17 00:00:00 2001
From: Ricardo Ribalda <ricardo.ribalda@xxxxxxxxx>
Date: Thu, 3 Mar 2016 16:12:48 -0300
Subject: [media] vb2-memops: Fix over allocation of frame vectors
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.
E.g:
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 */
Patches currently in stable-queue which might be from ricardo.ribalda@xxxxxxxxx are
queue-4.4/vb2-memops-fix-over-allocation-of-frame-vectors.patch
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