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avcodec/hevcdec: Avoid only partly skiping duplicate first slices

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Fixes: NULL pointer dereference and out of array access
Fixes: 13871/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5746167087890432
Fixes: 13845/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5650370728034304

This also fixes the return code for explode mode

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-03-23 20:55:08 +01:00
parent 681957b88d
commit 54655623a8
1 changed files with 10 additions and 4 deletions
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14
libavcodec/hevcdec.c
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@ -488,6 +488,11 @@ static int hls_slice_header(HEVCContext *s)
// Coded parameters
sh->first_slice_in_pic_flag = get_bits1(gb);
if (s->ref && sh->first_slice_in_pic_flag) {
av_log(s->avctx, AV_LOG_ERROR, "Two slices reporting being the first in the same frame.\n");
return 1; // This slice will be skiped later, do not corrupt state
}
if ((IS_IDR(s) || IS_BLA(s)) && sh->first_slice_in_pic_flag) {
s->seq_decode = (s->seq_decode + 1) & 0xff;
s->max_ra = INT_MAX;
@ -2918,6 +2923,11 @@ static int decode_nal_unit(HEVCContext *s, const H2645NAL *nal)
ret = hls_slice_header(s);
if (ret < 0)
return ret;
if (ret == 1) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (
(s->avctx->skip_frame >= AVDISCARD_BIDIR && s->sh.slice_type == HEVC_SLICE_B) ||
@ -2927,10 +2937,6 @@ static int decode_nal_unit(HEVCContext *s, const H2645NAL *nal)
}
if (s->sh.first_slice_in_pic_flag) {
if (s->ref) {
av_log(s->avctx, AV_LOG_ERROR, "Two slices reporting being the first in the same frame.\n");
goto fail;
}
if (s->max_ra == INT_MAX) {
if (s->nal_unit_type == HEVC_NAL_CRA_NUT || IS_BLA(s)) {
s->max_ra = s->poc;