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Make sure partition #0 is read before VP8 data in IDecode.

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BUG=oss-fuzz:9186

Change-Id: Ie0b264b6422774343206ddba3c2820a0cf37ffc0
(cherry picked from commit 5f0f5c07c4)
This commit is contained in:
Vincent Rabaud 2018-07-09 20:20:52 +02:00 committed by James Zern
parent c0226fd91c
commit 99d0790233
1 changed files with 8 additions and 1 deletions
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9
src/dec/idec_dec.c
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@ -449,7 +449,10 @@ static VP8StatusCode DecodeRemaining(WebPIDecoder* const idec) {
VP8Decoder* const dec = (VP8Decoder*)idec->dec_;
VP8Io* const io = &idec->io_;
assert(dec->ready_);
// Make sure partition #0 has been read before, to set dec to ready_.
if (!dec->ready_) {
return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR);
}
for (; dec->mb_y_ < dec->mb_h_; ++dec->mb_y_) {
if (idec->last_mb_y_ != dec->mb_y_) {
if (!VP8ParseIntraModeRow(&dec->br_, dec)) {
@ -570,6 +573,10 @@ static VP8StatusCode IDecode(WebPIDecoder* idec) {
status = DecodePartition0(idec);
}
if (idec->state_ == STATE_VP8_DATA) {
const VP8Decoder* const dec = (VP8Decoder*)idec->dec_;
if (dec == NULL) {
return VP8_STATUS_SUSPENDED; // can't continue if we have no decoder.
}
status = DecodeRemaining(idec);
}
if (idec->state_ == STATE_VP8L_HEADER) {