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media: vb2: check memory model for VIDIOC_CREATE_BUFS

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vb2_core_create_bufs did not check if the memory model for newly added
buffers is the same as for already existing buffers. It should return an
error if they aren't the same.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: syzbot+e1fb118a2ebb88031d21@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>      # for v4.16 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-11-08 07:23:37 -05:00 committed by Mauro Carvalho Chehab
parent 2912289a51
commit 62dcb4f418
1 changed files with 3 additions and 0 deletions
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3
drivers/media/common/videobuf2/videobuf2-core.c
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@ -812,6 +812,9 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
memset(q->alloc_devs, 0, sizeof(q->alloc_devs));
q->memory = memory;
q->waiting_for_buffers = !q->is_output;
} else if (q->memory != memory) {
dprintk(1, "memory model mismatch\n");
return -EINVAL;
}
num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers);