[FFmpeg-devel] [PATCH 3/5] avcodec/get_bits: Use FF_PTR_ADD() in init_get_bits()

[Kieran Kunhya]

On Thu, 3 Jul 2025, 03:02 Michael Niedermayer, <michael at niedermayer.cc>
wrote:

> Fixes: NULL + 0
> Fixes:
> 421817631/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APV_fuzzer-4957386534354944
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by
> <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
> Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/get_bits.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
> index 19542965697..bf6929aa65d 100644
> --- a/libavcodec/get_bits.h
> +++ b/libavcodec/get_bits.h
> @@ -511,7 +511,7 @@ static inline int init_get_bits(GetBitContext *s,
> const uint8_t *buffer,
>      s->buffer             = buffer;
>      s->size_in_bits       = bit_size;
>      s->size_in_bits_plus8 = bit_size + 8;
> -    s->buffer_end         = buffer + buffer_size;
> +    s->buffer_end         = buffer_size ? buffer + buffer_size : buffer;
>      s->index              = 0;
>
>      return ret;
> --
> 2.49.0
>

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>