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avcodec/h264_slice: clear frame only on gaps when it is not otherwise initilaized

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Fixes: Timeout (53sec -> 31sec)
Fixes: 16908/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5711207859748864

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 2019-09-08 19:27:26 +02:00
parent 340ab13504
commit 1e984a6915
1 changed files with 9 additions and 9 deletions
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18
libavcodec/h264_slice.c
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@ -458,12 +458,6 @@ static int h264_frame_start(H264Context *h)
H264Picture *pic;
int i, ret;
const int pixel_shift = h->pixel_shift;
int c[4] = {
1<<(h->ps.sps->bit_depth_luma-1),
1<<(h->ps.sps->bit_depth_chroma-1),
1<<(h->ps.sps->bit_depth_chroma-1),
-1
};
if (!ff_thread_can_start_frame(h->avctx)) {
av_log(h->avctx, AV_LOG_ERROR, "Attempt to start a frame outside SETUP state\n");
@ -504,8 +498,6 @@ static int h264_frame_start(H264Context *h)
if ((ret = alloc_picture(h, pic)) < 0)
return ret;
if(!h->frame_recovered && !h->avctx->hwaccel)
ff_color_frame(pic->f, c);
h->cur_pic_ptr = pic;
ff_h264_unref_picture(h, &h->cur_pic);
@ -1582,6 +1574,13 @@ static int h264_field_start(H264Context *h, const H264SliceContext *sl,
* vectors. Given we are concealing a lost frame, this probably
* is not noticeable by comparison, but it should be fixed. */
if (h->short_ref_count) {
int c[4] = {
1<<(h->ps.sps->bit_depth_luma-1),
1<<(h->ps.sps->bit_depth_chroma-1),
1<<(h->ps.sps->bit_depth_chroma-1),
-1
};
if (prev &&
h->short_ref[0]->f->width == prev->f->width &&
h->short_ref[0]->f->height == prev->f->height &&
@ -1597,7 +1596,8 @@ static int h264_field_start(H264Context *h, const H264SliceContext *sl,
prev->f->width,
prev->f->height);
h->short_ref[0]->poc = prev->poc + 2;
}
} else if (!h->frame_recovered && !h->avctx->hwaccel)
ff_color_frame(h->short_ref[0]->f, c);
h->short_ref[0]->frame_num = h->poc.prev_frame_num;
}
}