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Code Issues Releases Activity

avcodec/hevc_ps: Check num_ref_loc_offsets

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Fixes: Writing arbitrarily over the array end
Fixes: 57812/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4536557859373056

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-04-09 14:31:16 +02:00
parent 27e7857bd1
commit 80ac1fd148
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1 changed files with 4 additions and 0 deletions
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libavcodec/hevc_ps.c
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@ -1392,6 +1392,10 @@ static int pps_multilayer_extension(GetBitContext *gb, AVCodecContext *avctx,
pps->pps_scaling_list_ref_layer_id = get_bits(gb, 6);
pps->num_ref_loc_offsets = get_ue_golomb_long(gb);
if (pps->num_ref_loc_offsets > FF_ARRAY_ELEMS(pps->ref_loc_offset_layer_id)) {
pps->num_ref_loc_offsets = 0;
return AVERROR_INVALIDDATA;
}
for (int i = 0; i < pps->num_ref_loc_offsets; i++) {
pps->ref_loc_offset_layer_id[i] = get_bits(gb, 6);
pps->scaled_ref_layer_offset_present_flag[i] = get_bits1(gb);