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avcodec/hevcdec: fix segfault on invalid film grain metadata 

Invalid input files may contain film grain metadata which survives
ff_h274_film_grain_params_supported() but does not pass
av_film_grain_params_select(), leading to a SIGSEGV on hevc_frame_end().

Fix this by duplicating the av_film_grain_params_select() check at frame
init time.

An alternative solution here would be to defer the incompatibility check
to hevc_frame_end(), but this has the downside of allocating a film
grain buffer even when we already know we can't apply film grain.

Fixes: https://trac.ffmpeg.org/ticket/10951
This commit is contained in:
Niklas Haas 2024-04-06 13:11:09 +02:00
parent baf17c15be
commit 459648761f
1 changed files with 8 additions and 7 deletions
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15
libavcodec/hevcdec.c
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@ -2893,10 +2893,15 @@ static int hevc_frame_start(HEVCContext *s)
!(s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN) &&
!s->avctx->hwaccel;
ret = set_side_data(s);
if (ret < 0)
goto fail;
if (s->ref->needs_fg &&
s->sei.common.film_grain_characteristics.present &&
!ff_h274_film_grain_params_supported(s->sei.common.film_grain_characteristics.model_id,
s->ref->frame->format)) {
( s->sei.common.film_grain_characteristics.present &&
!ff_h274_film_grain_params_supported(s->sei.common.film_grain_characteristics.model_id,
s->ref->frame->format))
|| !av_film_grain_params_select(s->ref->frame)) {
av_log_once(s->avctx, AV_LOG_WARNING, AV_LOG_DEBUG, &s->film_grain_warning_shown,
"Unsupported film grain parameters. Ignoring film grain.\n");
s->ref->needs_fg = 0;
@ -2910,10 +2915,6 @@ static int hevc_frame_start(HEVCContext *s)
goto fail;
}
ret = set_side_data(s);
if (ret < 0)
goto fail;
s->frame->pict_type = 3 - s->sh.slice_type;
if (!IS_IRAP(s))