avcodec/hevc_mp4toannexb_bsf: Check NAL size against available input
The hevc_mp4toannexb bsf does not explicitly check whether a NAL unit is so big that it extends beyond the end of the input packet; it does so only implicitly by using the checked version of the bytestream2 API. But this has downsides compared to real checks: It can lead to huge allocations (up to 2GiB) even when the input packet is just a few bytes. And furthermore it leads to uninitialized data being output. So add a check to error out early if it happens. Also check directly whether there is enough data for the length field. Reviewed-by:Michael Niedermayer <michael@niedermayer.cc> Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@gmail.com> (cherry picked from commit ea1b71e82f5a1752d59d3bfb9704092a79eba6b5)
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