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avcodec/h264_parse: Check picture structure when initializing weight table

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Fixes: runtime error: index 49 out of bounds for type 'int [48][2][2]'
Fixes: 2159/clusterfuzz-testcase-minimized-5267945972301824

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 2017-06-10 00:13:07 +02:00
parent e1b0044c23
commit 09096fb687
4 changed files with 14 additions and 9 deletions
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15
libavcodec/h264_parse.c
View File

@ -26,7 +26,8 @@
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
const int *ref_count, int slice_type_nos,
H264PredWeightTable *pwt, void *logctx)
H264PredWeightTable *pwt,
int picture_structure, void *logctx)
{
int list, i, j;
int luma_def, chroma_def;
@ -98,11 +99,13 @@ int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
}
// for MBAFF
pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
for (j = 0; j < 2; j++) {
pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
if (picture_structure == PICT_FRAME) {
pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
for (j = 0; j < 2; j++) {
pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
}
}
}
if (slice_type_nos != AV_PICTURE_TYPE_B)

3
libavcodec/h264_parse.h
View File

@ -55,7 +55,8 @@ typedef struct H264POCContext {
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
const int *ref_count, int slice_type_nos,
H264PredWeightTable *pwt, void *logctx);
H264PredWeightTable *pwt,
int picture_structure, void *logctx);
/**
* Check if the top & left blocks are available if needed & change the

2
libavcodec/h264_parser.c
View File

@ -202,7 +202,7 @@ static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
(p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
&pwt, logctx);
&pwt, p->picture_structure, logctx);
if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
int i;

3
libavcodec/h264_slice.c
View File

@ -1801,7 +1801,8 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
(pps->weighted_bipred_idc == 1 &&
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);
sl->slice_type_nos, &sl->pwt,
picture_structure, h->avctx);
if (ret < 0)
return ret;
}