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media: cedrus: Fix endless loop in cedrus_h265_skip_bits()

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commit 91db7a3fc7fe670cf1770a398a43bb4a1f776bf1 upstream.

The busy status bit may never de-assert if number of programmed skip
bits is incorrect, resulting in a kernel hang because the bit is polled
endlessly in the code. Fix it by adding timeout for the bit-polling.
This problem is reproducible by setting the data_bit_offset field of
the HEVC slice params to a wrong value by userspace.

Cc: stable@vger.kernel.org
Fixes: 7678c5462680 (media: cedrus: Fix decoding for some HEVC videos)
Reported-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Osipenko 2022-08-18 22:33:08 +02:00 committed by Greg Kroah-Hartman
parent b76fac61c3
commit e8e0a6f4b8
1 changed files with 3 additions and 2 deletions

5
drivers/staging/media/sunxi/cedrus/cedrus_h265.c

@ -234,8 +234,9 @@ static void cedrus_h265_skip_bits(struct cedrus_dev *dev, int num)
cedrus_write(dev, VE_DEC_H265_TRIGGER,
VE_DEC_H265_TRIGGER_FLUSH_BITS |
VE_DEC_H265_TRIGGER_TYPE_N_BITS(tmp));
while (cedrus_read(dev, VE_DEC_H265_STATUS) & VE_DEC_H265_STATUS_VLD_BUSY)
udelay(1);
if (cedrus_wait_for(dev, VE_DEC_H265_STATUS, VE_DEC_H265_STATUS_VLD_BUSY))
dev_err_ratelimited(dev->dev, "timed out waiting to skip bits\n");
count += tmp;
}