Further protect against invalid Huffman codes

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.0.x@324 632fc199-4ca6-4c93-a231-07263d6284db

ChangeLog.txt

@@ -1,3 +1,9 @@
+Significant changes since 1.0.1
+===============================
+
+[1] Added further protections against invalid Huffman codes.
+
+
 Significant changes since 1.0.0
 ===============================
 

jdhuff.c

@@ -658,7 +658,7 @@ decode_mcu_slow (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
       symbol |= GET_BITS(1); \
       size++; \
     } \
-    symbol = htbl->pub->huffval[ (int) (symbol + htbl->valoffset[size]) ]; \
+    symbol = htbl->pub->huffval[ (int) (symbol + htbl->valoffset[size]) & 0xFF ]; \
   } \
 }