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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-03-21 23:46:14 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-14 12:20:15 +0200 |
| commit | 7655f73c45a1c81569812764c48113a7fa726eca (patch) | |
| tree | e3cd7072789fdbe718c2f79951f70bf26f3d32fc | |
| parent | 2d0c5899413cc097e1c16742e28408a1eb85e32f (diff) | |
| download | ffmpeg-7655f73c45a1c81569812764c48113a7fa726eca.tar.gz | |
avcodec/h264: Check weight values to be within the specs limits.
Fixes: integer overflows
Fixes: 911/clusterfuzz-testcase-5415105606975488
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Reviewed-by: "Ronald S. Bultje" <rsbultje@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 08117a40157464f8a9dcc2df393fa5fe299c1e98)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/h264_parse.c | 9 | ||||
| -rw-r--r-- | libavcodec/h264_slice.c | 7 |
2 files changed, 14 insertions, 2 deletions
diff --git a/libavcodec/h264_parse.c b/libavcodec/h264_parse.c index 0c873196dc..ea202e759c 100644 --- a/libavcodec/h264_parse.c +++ b/libavcodec/h264_parse.c @@ -59,6 +59,9 @@ int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, if (luma_weight_flag) { pwt->luma_weight[i][list][0] = get_se_golomb(gb); pwt->luma_weight[i][list][1] = get_se_golomb(gb); + if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] || + (int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1]) + goto out_range_weight; if (pwt->luma_weight[i][list][0] != luma_def || pwt->luma_weight[i][list][1] != 0) { pwt->use_weight = 1; @@ -76,6 +79,9 @@ int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, for (j = 0; j < 2; j++) { pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb); pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb); + if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] || + (int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1]) + goto out_range_weight; if (pwt->chroma_weight[i][list][j][0] != chroma_def || pwt->chroma_weight[i][list][j][1] != 0) { pwt->use_weight_chroma = 1; @@ -104,6 +110,9 @@ int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, } pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma; return 0; +out_range_weight: + avpriv_request_sample(logctx, "Out of range weight\n"); + return AVERROR_INVALIDDATA; } /** diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c index 8aaa37043b..b47d95706e 100644 --- a/libavcodec/h264_slice.c +++ b/libavcodec/h264_slice.c @@ -1684,9 +1684,12 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl, } if ((pps->weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) || (pps->weighted_bipred_idc == 1 && - sl->slice_type_nos == AV_PICTURE_TYPE_B)) - ff_h264_pred_weight_table(&sl->gb, sps, sl->ref_count, + sl->slice_type_nos == AV_PICTURE_TYPE_B)) { + ret = ff_h264_pred_weight_table(&sl->gb, sps, sl->ref_count, sl->slice_type_nos, &sl->pwt, h->avctx); + if (ret < 0) + return ret; + } sl->explicit_ref_marking = 0; if (nal->ref_idc) { |