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avcodec/av1dec: Check for unset obu instead of crashing 

Fixes: NULL pointer dereference
Fixes: 26550/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-5417762807349248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-26 00:00:56 +01:00
parent 343c3149ab
commit 718e862da3
1 changed files with 6 additions and 1 deletions
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7
libavcodec/av1dec.c
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@ -673,7 +673,12 @@ static int av1_decode_frame(AVCodecContext *avctx, void *frame,
for (int i = 0; i < s->current_obu.nb_units; i++) {
CodedBitstreamUnit *unit = &s->current_obu.units[i];
AV1RawOBU *obu = unit->content;
const AV1RawOBUHeader *header = &obu->header;
const AV1RawOBUHeader *header;
if (!obu)
continue;
header = &obu->header;
av_log(avctx, AV_LOG_DEBUG, "Obu idx:%d, obu type:%d.\n", i, unit->type);
switch (unit->type) {