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avcodec/ivi: Allocate bufs later

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Fixes: Timeout (24sec->2sec)
Fixes: 15951/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INDEO5_fuzzer-5095433266790400

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 2019-08-14 01:28:09 +02:00
parent ba823394f6
commit 15a65c13e1
1 changed files with 20 additions and 19 deletions
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39
libavcodec/ivi.c
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@ -354,23 +354,11 @@ av_cold int ff_ivi_init_planes(AVCodecContext *avctx, IVIPlaneDesc *planes, cons
band->height = b_height;
band->pitch = width_aligned;
band->aheight = height_aligned;
band->bufs[0] = av_mallocz(buf_size);
band->bufs[1] = av_mallocz(buf_size);
av_assert0(!band->bufs[0] && !band->bufs[1] &&
!band->bufs[2] && !band->bufs[3]);
band->bufsize = buf_size/2;
if (!band->bufs[0] || !band->bufs[1])
return AVERROR(ENOMEM);
av_assert0(buf_size % 2 == 0);
/* allocate the 3rd band buffer for scalability mode */
if (cfg->luma_bands > 1) {
band->bufs[2] = av_mallocz(buf_size);
if (!band->bufs[2])
return AVERROR(ENOMEM);
}
if (is_indeo4) {
band->bufs[3] = av_mallocz(buf_size);
if (!band->bufs[3])
return AVERROR(ENOMEM);
}
/* reset custom vlc */
planes[p].bands[0].blk_vlc.cust_desc.num_rows = 0;
}
@ -945,6 +933,15 @@ static void ivi_output_plane(IVIPlaneDesc *plane, uint8_t *dst, ptrdiff_t dst_pi
}
}
static void *prepare_buf(IVI45DecContext *ctx, IVIBandDesc *band, int i)
{
if (ctx->pic_conf.luma_bands <= 1 && i == 2)
return NULL;
if (!band->bufs[i])
band->bufs[i] = av_mallocz(2 * band->bufsize);
return band->bufs[i];
}
/**
* Decode an Indeo 4 or 5 band.
*
@ -959,18 +956,22 @@ static int decode_band(IVI45DecContext *ctx,
int result, i, t, idx1, idx2, pos;
IVITile *tile;
band->buf = band->bufs[ctx->dst_buf];
band->buf = prepare_buf(ctx, band, ctx->dst_buf);
if (!band->buf) {
av_log(avctx, AV_LOG_ERROR, "Band buffer points to no data!\n");
return AVERROR_INVALIDDATA;
}
if (ctx->is_indeo4 && ctx->frame_type == IVI4_FRAMETYPE_BIDIR) {
band->ref_buf = band->bufs[ctx->b_ref_buf];
band->b_ref_buf = band->bufs[ctx->ref_buf];
band->ref_buf = prepare_buf(ctx, band, ctx->b_ref_buf);
band->b_ref_buf = prepare_buf(ctx, band, ctx->ref_buf);
if (!band->b_ref_buf)
return AVERROR(ENOMEM);
} else {
band->ref_buf = band->bufs[ctx->ref_buf];
band->ref_buf = prepare_buf(ctx, band, ctx->ref_buf);
band->b_ref_buf = 0;
}
if (!band->ref_buf)
return AVERROR(ENOMEM);
band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
result = ctx->decode_band_hdr(ctx, band, avctx);