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media: tw5864: Fix possible NULL pointer dereference in tw5864_handle_frame

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'vb' null check should be done before dereferencing it in
tw5864_handle_frame, otherwise a NULL pointer dereference
may occur.

Fixes: 34d1324edd ("[media] pci: Add tw5864 driver")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
YueHaibing 2019-03-14 22:01:24 -04:00 committed by Mauro Carvalho Chehab
parent f8ee34c3e7
commit 2e7682ebfc
1 changed files with 2 additions and 2 deletions
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4
drivers/media/pci/tw5864/tw5864-video.c
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@ -1395,13 +1395,13 @@ static void tw5864_handle_frame(struct tw5864_h264_frame *frame)
input->vb = NULL;
spin_unlock_irqrestore(&input->slock, flags);
v4l2_buf = to_vb2_v4l2_buffer(&vb->vb.vb2_buf);
if (!vb) { /* Gone because of disabling */
dev_dbg(&dev->pci->dev, "vb is empty, dropping frame\n");
return;
}
v4l2_buf = to_vb2_v4l2_buffer(&vb->vb.vb2_buf);
/*
* Check for space.
* Mind the overhead of startcode emulation prevention.