shithub: openh264

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refine level check

--- a/codec/decoder/core/inc/error_code.h

+++ b/codec/decoder/core/inc/error_code.h

@@ -133,6 +133,7 @@

   ERR_INFO_INVALID_CBP,

   ERR_INFO_DQUANT_OUT_OF_RANGE,

   ERR_INFO_CAVLC_INVALID_PREFIX,

+  ERR_INFO_CAVLC_INVALID_LEVEL,

   ERR_INFO_CAVLC_INVALID_TOTAL_COEFF_OR_TRAILING_ONES,

   ERR_INFO_CAVLC_INVALID_ZERO_LEFT,

   ERR_INFO_CAVLC_INVALID_RUN_BEFORE,

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

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

@@ -718,8 +718,10 @@

   if ((uiTrailingOnes > 3) || (uiTotalCoeff > 16)) { /////////////////check uiTrailingOnes and uiTotalCoeff

     return ERR_INFO_CAVLC_INVALID_TOTAL_COEFF_OR_TRAILING_ONES;

   }

-  iUsedBits += CavlcGetLevelVal (iLevel, &sReadBitsCache, uiTotalCoeff, uiTrailingOnes);

-

+  if ((i = CavlcGetLevelVal (iLevel, &sReadBitsCache, uiTotalCoeff, uiTrailingOnes)) == -1) {

+    return ERR_INFO_CAVLC_INVALID_LEVEL;

+  }

+  iUsedBits += i;

   if (uiTotalCoeff < iMaxNumCoeff) {

     iUsedBits += CavlcGetTotalZeros (iZerosLeft, &sReadBitsCache, uiTotalCoeff, pVlcTable, bChromaDc);

   } else {