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avcodec/cbs_av1_syntax_template: Check ref_frame_idx before use 

Fixes: index -1 out of bounds for type 'AV1ReferenceFrameState [8]'
Fixes: 16079/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5758807440883712

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial@gmail.com>
See: [FFmpeg-devel] [PATCH 05/13] avcodec/cbs_av1_syntax_template: Check ref_frame_idx before use
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-04 09:51:26 +02:00
parent 392c028cd2
commit 8174e5c77d
1 changed files with 4 additions and 3 deletions
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7
libavcodec/cbs_av1_syntax_template.c
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@ -419,16 +419,17 @@ static int FUNC(frame_size_with_refs)(CodedBitstreamContext *ctx, RWContext *rw,
for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
flags(found_ref[i], 1, i);
if (current->found_ref[i]) {
AV1ReferenceFrameState *ref =
&priv->ref[current->ref_frame_idx[i]];
AV1ReferenceFrameState *ref;
if (!ref->valid) {
if (current->ref_frame_idx[i] < 0 ||
!priv->ref[current->ref_frame_idx[i]].valid) {
av_log(ctx->log_ctx, AV_LOG_ERROR,
"Missing reference frame needed for frame size "
"(ref = %d, ref_frame_idx = %d).\n",
i, current->ref_frame_idx[i]);
return AVERROR_INVALIDDATA;
}
ref = &priv->ref[current->ref_frame_idx[i]];
priv->upscaled_width = ref->upscaled_width;
priv->frame_width = ref->frame_width;