Add bounds checking to ERR_MSG() macro, used by zError().

1 year ago · 431a9b65ea
parent 643e17b749
commit 431a9b65ea
1 changed files with 1 additions and 1 deletions
--- a/zutil.h
+++ b/zutil.h
@ -56,7 +56,7 @@ typedef unsigned long  ulg;
 extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 /* (size given to avoid silly warnings with Visual C++) */

-#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
+#define ERR_MSG(err) z_errmsg[(err) < -6 || (err) > 2 ? 9 : 2 - (err)]

 #define ERR_RETURN(strm,err) \
  return (strm->msg = ERR_MSG(err), (err))