[FFmpeg-devel] [PATCH] [h264] Use small padding with the checked bitstream reader.

[Dale Curtis]

On Sat, Aug 17, 2024 at 12:25 PM James Almer <jamrial at gmail.com> wrote:

> On 8/17/2024 3:04 PM, Michael Niedermayer wrote:
> >
> >
> 20978/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5746381832847360
> sent privately
>

Thanks for the sample Michael. I've confirmed it does not reproduce with my
change when the checked bitstream reader is used -- and does reproduce with
small_pad=true and the unchecked bitstream reader.


> >
> > thx
>
> Could the padding be changed to AV_INPUT_BUFFER_PADDING_SIZE instead of
> 0 when small_padding is requested?
>

Either 0 or AV_INPUT_BUFFER_PADDING_SIZE works with the checked bitstream
reader. AV_INPUT_BUFFER_PADDING_SIZE isn't sufficient to fix the fuzzer
test case when small_pad=true and the unchecked bitstream reader is used
though.


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