tree ca56b6b071886c839e362cb07e3e0946295e9a68
parent a3a2e782c2ab5ccfcd864f476e6c3b7aa03c8dcf
author Andreas Rheinhardt <andreas.rheinhardt@gmail.com> 1590599354 +0200
committer Andreas Rheinhardt <andreas.rheinhardt@gmail.com> 1593727446 +0200

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)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>