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Merge pull request #3293 from xiaotianshi2/issue_20491

Fix oss-fuzz 20491. OpenH264 issue #3282

--- a/codec/decoder/core/src/manage_dec_ref.cpp

+++ b/codec/decoder/core/src/manage_dec_ref.cpp

@@ -394,7 +394,10 @@

   for (int32_t listIdx = 0; listIdx < ListCount; ++listIdx) {

     PPicture pPic = NULL;

     PPicture* ppRefList = pCtx->sRefPic.pRefList[listIdx];

-    int32_t iMaxRefIdx = pCtx->iPicQueueNumber;

+    int32_t  iMaxRefIdx = pCtx->iPicQueueNumber;

+    if (iMaxRefIdx >= MAX_REF_PIC_COUNT) {

+      iMaxRefIdx = MAX_REF_PIC_COUNT - 1;

+    }

     int32_t iRefCount = pSliceHeader->uiRefCount[listIdx];

     int32_t iPredFrameNum = pSliceHeader->iFrameNum;

     int32_t iMaxPicNum = 1 << pSliceHeader->pSps->uiLog2MaxFrameNum;