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third_party_ffmpeg/libavcodec/h264_mc_template.c
Michael Niedermayer 8b55591757 avcodec/h264_mc_template: Only prefetch motion if the list is used. 
Fixes: index 59 out of bounds for type 'H264Ref [48]'
Fixes: 8232/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5703295145345024

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2018-06-11 00:51:20 +02:00

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/*
* H.26L/H.264/AVC/JVT/14496-10/... decoder
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "h264dec.h"
#undef MCFUNC
#if CHROMA_IDC == 1
# define MCFUNC(n) FUNC(n ## _420)
#elif CHROMA_IDC == 2
# define MCFUNC(n) FUNC(n ## _422)
#elif CHROMA_IDC == 3
# define MCFUNC(n) FUNC(n ## _444)
#endif
#undef mc_part
#define mc_part MCFUNC(mc_part)
static void mc_part(const H264Context *h, H264SliceContext *sl,
int n, int square,
int height, int delta,
uint8_t *dest_y, uint8_t *dest_cb,
uint8_t *dest_cr,
int x_offset, int y_offset,
const qpel_mc_func *qpix_put,
h264_chroma_mc_func chroma_put,
const qpel_mc_func *qpix_avg,
h264_chroma_mc_func chroma_avg,
const h264_weight_func *weight_op,
const h264_biweight_func *weight_avg,
int list0, int list1)
{
if ((sl->pwt.use_weight == 2 && list0 && list1 &&
(sl->pwt.implicit_weight[sl->ref_cache[0][scan8[n]]][sl->ref_cache[1][scan8[n]]][sl->mb_y & 1] != 32)) ||
sl->pwt.use_weight == 1)
mc_part_weighted(h, sl, n, square, height, delta, dest_y, dest_cb, dest_cr,
x_offset, y_offset, qpix_put, chroma_put,
weight_op[0], weight_op[1], weight_avg[0],
weight_avg[1], list0, list1, PIXEL_SHIFT, CHROMA_IDC);
else
mc_part_std(h, sl, n, square, height, delta, dest_y, dest_cb, dest_cr,
x_offset, y_offset, qpix_put, chroma_put, qpix_avg,
chroma_avg, list0, list1, PIXEL_SHIFT, CHROMA_IDC);
}
static void MCFUNC(hl_motion)(const H264Context *h, H264SliceContext *sl,
uint8_t *dest_y,
uint8_t *dest_cb, uint8_t *dest_cr,
const qpel_mc_func(*qpix_put)[16],
const h264_chroma_mc_func(*chroma_put),
const qpel_mc_func(*qpix_avg)[16],
const h264_chroma_mc_func(*chroma_avg),
const h264_weight_func *weight_op,
const h264_biweight_func *weight_avg)
{
const int mb_xy = sl->mb_xy;
const int mb_type = h->cur_pic.mb_type[mb_xy];
av_assert2(IS_INTER(mb_type));
if (HAVE_THREADS && (h->avctx->active_thread_type & FF_THREAD_FRAME))
await_references(h, sl);
if (USES_LIST(mb_type, 0))
prefetch_motion(h, sl, 0, PIXEL_SHIFT, CHROMA_IDC);
if (IS_16X16(mb_type)) {
mc_part(h, sl, 0, 1, 16, 0, dest_y, dest_cb, dest_cr, 0, 0,
qpix_put[0], chroma_put[0], qpix_avg[0], chroma_avg[0],
weight_op, weight_avg,
IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
} else if (IS_16X8(mb_type)) {
mc_part(h, sl, 0, 0, 8, 8 << PIXEL_SHIFT, dest_y, dest_cb, dest_cr, 0, 0,
qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],
weight_op, weight_avg,
IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
mc_part(h, sl, 8, 0, 8, 8 << PIXEL_SHIFT, dest_y, dest_cb, dest_cr, 0, 4,
qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],
weight_op, weight_avg,
IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
} else if (IS_8X16(mb_type)) {
mc_part(h, sl, 0, 0, 16, 8 * sl->mb_linesize, dest_y, dest_cb, dest_cr, 0, 0,
qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
&weight_op[1], &weight_avg[1],
IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
mc_part(h, sl, 4, 0, 16, 8 * sl->mb_linesize, dest_y, dest_cb, dest_cr, 4, 0,
qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
&weight_op[1], &weight_avg[1],
IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
} else {
int i;
av_assert2(IS_8X8(mb_type));
for (i = 0; i < 4; i++) {
const int sub_mb_type = sl->sub_mb_type[i];
const int n = 4 * i;
int x_offset = (i & 1) << 2;
int y_offset = (i & 2) << 1;
if (IS_SUB_8X8(sub_mb_type)) {
mc_part(h, sl, n, 1, 8, 0, dest_y, dest_cb, dest_cr,
x_offset, y_offset,
qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
&weight_op[1], &weight_avg[1],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
} else if (IS_SUB_8X4(sub_mb_type)) {
mc_part(h, sl, n, 0, 4, 4 << PIXEL_SHIFT, dest_y, dest_cb, dest_cr,
x_offset, y_offset,
qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],
&weight_op[1], &weight_avg[1],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
mc_part(h, sl, n + 2, 0, 4, 4 << PIXEL_SHIFT,
dest_y, dest_cb, dest_cr, x_offset, y_offset + 2,
qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],
&weight_op[1], &weight_avg[1],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
} else if (IS_SUB_4X8(sub_mb_type)) {
mc_part(h, sl, n, 0, 8, 4 * sl->mb_linesize,
dest_y, dest_cb, dest_cr, x_offset, y_offset,
qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
&weight_op[2], &weight_avg[2],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
mc_part(h, sl, n + 1, 0, 8, 4 * sl->mb_linesize,
dest_y, dest_cb, dest_cr, x_offset + 2, y_offset,
qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
&weight_op[2], &weight_avg[2],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
} else {
int j;
av_assert2(IS_SUB_4X4(sub_mb_type));
for (j = 0; j < 4; j++) {
int sub_x_offset = x_offset + 2 * (j & 1);
int sub_y_offset = y_offset + (j & 2);
mc_part(h, sl, n + j, 1, 4, 0,
dest_y, dest_cb, dest_cr, sub_x_offset, sub_y_offset,
qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
&weight_op[2], &weight_avg[2],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
}
}
}
}
if (USES_LIST(mb_type, 1))
prefetch_motion(h, sl, 1, PIXEL_SHIFT, CHROMA_IDC);
}
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