Avoid undefined behavior that accessed just before the start of an array.

[bison.git] / ChangeLog

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+2006-01-18  Paul Eggert  <eggert@cs.ucla.edu>
+
+       Avoid undefined behavior that accessed just before the start of an
+       array.  Problem reported by twlevo.
+       * src/reader.c (packgram): Prepend a new sentinel before ritem.
+       * src/lalr.c (build_relations): Rely on new sentinel.
+       * src/gram.c (gram_free): Adjust to new sentinel.
+
 2006-01-12  Joel E. Denny  <jdenny@ces.clemson.edu>
 
        * data/glr.c (yyGLRStateSet): Rename yylookaheadStatuses to