Re: [FFmpeg-devel] [PATCH v0 02/14] avcodec: move AVCodecInternal allocation to avcodec_alloc_context3

[Michael Niedermayer <michael@niedermayer.cc>]

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On Tue, Mar 21, 2023 at 01:33:56AM +0200, Jan Ekström wrote:
> This allows for private values to be stored before the {de,en}coder
> has been opened and initialized.
> 
> Add a new unsigned boolean entry to specifically note that a
> context has been opened instead of just depending on the internal
> pointer.
> ---
>  libavcodec/avcodec.c              | 18 +++++++++++-------
>  libavcodec/frame_thread_encoder.c |  7 ++++---
>  libavcodec/internal.h             |  5 +++++
>  libavcodec/options.c              | 20 +++++++++++++++++++-
>  4 files changed, 39 insertions(+), 11 deletions(-)

this causes memory corruption with mjpeg
./ffmpeg_g -i lena.pnm -qscale 4 -intra_matrix 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10 -chroma_intra_matrix 400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400,400 -bitexact file-custommatrix10,400.jpg

i see

video:19kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
corrupted size vs. prev_size
Aborted (core dumped)

i can provide more details if it isnt reproduceable

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you think the mosad wants you dead since a long time then you are either
wrong or dead since a long time.

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