An alternative would be to leave the context unchanged on failure of hls_slice_header()
Fixes: out of array access Fixes: NULL pointer dereference Fixes: 69584/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5931086299856896 Fixes: 69724/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5104066422702080 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/hevc/hevcdec.c | 5 +++++ libavcodec/hevc/hevcdec.h | 1 + 2 files changed, 6 insertions(+) diff --git a/libavcodec/hevc/hevcdec.c b/libavcodec/hevc/hevcdec.c index 4dd84d4953c..0e0a910641f 100644 --- a/libavcodec/hevc/hevcdec.c +++ b/libavcodec/hevc/hevcdec.c @@ -626,6 +626,10 @@ static int hls_slice_header(SliceHeader *sh, const HEVCContext *s, GetBitContext if (pps->dependent_slice_segments_enabled_flag) sh->dependent_slice_segment_flag = get_bits1(gb); + if (sh->dependent_slice_segment_flag && sh->slice_failure) { + av_log(s->avctx, AV_LOG_ERROR, "dependent slice failed\n"); + return AVERROR_INVALIDDATA; + } slice_address_length = av_ceil_log2(sps->ctb_width * sps->ctb_height); @@ -3157,6 +3161,7 @@ static int decode_slice(HEVCContext *s, const H2645NAL *nal, GetBitContext *gb) int ret; ret = hls_slice_header(&s->sh, s, gb); + s->sh.slice_failure = ret; if (ret < 0) return ret; diff --git a/libavcodec/hevc/hevcdec.h b/libavcodec/hevc/hevcdec.h index da4d83e6615..91f20ea26ab 100644 --- a/libavcodec/hevc/hevcdec.h +++ b/libavcodec/hevc/hevcdec.h @@ -213,6 +213,7 @@ typedef struct SliceHeader { uint8_t first_slice_in_pic_flag; uint8_t dependent_slice_segment_flag; + uint8_t slice_failure; uint8_t pic_output_flag; uint8_t colour_plane_id; -- 2.45.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
