[FFmpeg-devel] [PATCH 1/8] avutil/mem: Handle fast allocations near UINT_MAX properly

[Tomas Härdin]

tis 2022-07-05 klockan 22:09 +0200 skrev Andreas Rheinhardt:
> av_fast_realloc and av_fast_mallocz? store the size of
> the objects they allocate in an unsigned. Yet they overallocate
> and currently they can allocate more than UINT_MAX bytes
> in case a user has requested a size of about UINT_MAX * 16 / 17
> or more if SIZE_MAX > UINT_MAX. In this case it is impossible
> to store the true size of the buffer via the unsigned*;
> future requests are likely to use the (re)allocation codepath
> even if the buffer is actually large enough because of
> the incorrect size.
> 
> Fix this by ensuring that the actually allocated size
> always fits into an unsigned. (This entails erroring out
> in case the user requested more than UINT_MAX.)
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
> ---
>  libavutil/mem.c | 4 ++++
>  1 file changed, 4 insertions(+)

Second bump for this and patch 3/8. This is holding up my rebasing my
jpeg2000 patches and indirectly Caleb's htj2k stuff benefiting from
them

/Tomas