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avcodec/mpegpicture: Keep ff_mpeg_framesize_alloc() failure state consistent 

Fixes: null pointer dereference
Fixes: ff_put_pixels16_sse2.mp4

Found-by: Rafael Dutra <rafael.dutra@cispa.de>
Regression-since: 4b2863ff01
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-18 19:19:54 +01:00
parent 6cc65d3d67
commit 76cea1d2ce
1 changed files with 4 additions and 1 deletions
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5
libavcodec/mpegpicture.c
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@ -79,8 +79,11 @@ int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
// linesize * interlaced * MBsize
// we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
if (!FF_ALLOCZ_TYPED_ARRAY(sc->edge_emu_buffer, alloc_size * EMU_EDGE_HEIGHT) ||
!FF_ALLOCZ_TYPED_ARRAY(me->scratchpad, alloc_size * 4 * 16 * 2))
!FF_ALLOCZ_TYPED_ARRAY(me->scratchpad, alloc_size * 4 * 16 * 2)) {
av_freep(&sc->edge_emu_buffer);
return AVERROR(ENOMEM);
}
me->temp = me->scratchpad;
sc->rd_scratchpad = me->scratchpad;
sc->b_scratchpad = me->scratchpad;