[FFmpeg-devel] H263 decoding crash, [BUG] : reading memory past the end of the buffer.
Fri Jun 5 19:06:09 CEST 2009
> Even if your mail was not meant for this list, the answer is:
> RTFD (read the fine documentation) before using a function.
> I paste the relevant part of avcodec.h for your convenience:
> * Decodes a video frame from \p buf into \p picture.
> * The avcodec_decode_video() function decodes a video frame
> from the input
> * buffer \p buf of size \p buf_size. To decode it, it makes
> use of the
> * video codec which was coupled with \p avctx using
> avcodec_open(). The
> * resulting decoded frame is stored in \p picture.
> * @warning The input buffer must be \c
> FF_INPUT_BUFFER_PADDING_SIZE larger than
> * the actual read bytes because some optimized bitstream
> readers read
> 32 or 64
> * bits at once and could read over the end.
> int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
> int *got_picture_ptr,
> const uint8_t *buf, int buf_size);
If I had control, I would add in debug mode code that checks
provided buffer that FF_INPUT_BUFFER_PADDING_SIZE bytes past the
end are readable. So that at least with debug build it would be caught
instantly, not like rarely after running it for long time in release
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