🚀 go-pugleaf

This reports a small bug and a fix for GNU regex.c version 0.11.

The POSIX function regcomp(preg, pattern, cflags) does not initialize the field
preg->allocated to 0 before calling regex_compile(). Dependent on the random
value of this field, this causes regex_compile() to abort with a SEGV. Here
is the patch:

------------------------------------------------------------------------------
**************
*** 4683,4690
      = cflags & REG_EXTENDED ? RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;
  
    /* regex_compile will allocate the space for the compiled pattern.  */
    preg->buffer = 0;
    
    /* Don't bother to use a fastmap when searching.  This simplifies the
       REG_NEWLINE case: if we used a fastmap, we'd have to put all the
       characters after newlines into the fastmap.  This way, we just try
--- 4687,4695 -----
      = cflags & REG_EXTENDED ? RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;
  
    /* regex_compile will allocate the space for the compiled pattern.  */
    preg->buffer = 0;
+   preg->allocated = 0;
    
    /* Don't bother to use a fastmap when searching.  This simplifies the
       REG_NEWLINE case: if we used a fastmap, we'd have to put all the
       characters after newlines into the fastmap.  This way, we just try
------------------------------------------------------------------------------

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