For some bitstream, get_cabac_bypass() will read 2 extra bytes

[hxz1986]

And it will crash for memory out of bound error. Is it a known issue?

Thanks!!

[pcabarat]

Hi.
We didn't know about this issue. Can you provide us with a bitstream so we can reproduce the issue?
Which branch did you use?

Pierre-Loup

[hxz1986]

Hi Pierre-Loup,

Thanks for your quick response. I attached the bitstream. It seems the
cabac decoder of openhevc will read 2 bytes ahead. In some cases, it will
read memory out of bound.

Xiaozheng

BR,
Xiaozheng Huang

2016-10-18 18:59 GMT+08:00 Pierre-Loup Cabarat [email protected]:

Hi.
We didn't know about this issue. Can you provide us with a bitstream so we
can reproduce the issue?
What branch did you use?

Pierre-Loup

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[hxz1986]

The latest openhevc can still reproduce this issue.

BR,
Xiaozheng Huang

2016-10-19 10:26 GMT+08:00 Huang Xiaozheng [email protected]:

Hi Pierre-Loup,

Thanks for your quick response. I attached the bitstream. It seems the
cabac decoder of openhevc will read 2 bytes ahead. In some cases, it will
read memory out of bound.

Xiaozheng

BR,
Xiaozheng Huang

2016-10-18 18:59 GMT+08:00 Pierre-Loup Cabarat [email protected]:

Hi.
We didn't know about this issue. Can you provide us with a bitstream so
we can reproduce the issue?
What branch did you use?

Pierre-Loup

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You are receiving this because you authored the thread.
Reply to this email directly, view it on GitHub
#50 (comment),
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[hxz1986]

It seems email attachment does not work. I attached a problematic bitstream here. Please remove ".txt".
2bytes.265.txt

[hxz1986]

To repro this issue, you must allocate the exact number of bytes as the the bitstream size and use app verifier to help repro this crash.

[pcabarat]

It plays well on Rext and HEVC_extensions on my computer. I'll need more explanations:
What do you mean by allocate the exact number of bytes as the bitstream?
How do you use the decoder?
When does it crash? (end of decoding)
Does it works on other streams ?