[Bug libc/18043] buffer-overflow (read past the end) in wordexp/parse_dollars/parse_param

["konstantin.s.serebryany at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18043

Kostya Serebryany <konstantin.s.serebryany at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #4 from Kostya Serebryany <konstantin.s.serebryany at gmail dot com> ---
Thanks for the fix. There is one more, very similar looking bug, 
but it still reproduces after your fix. 

#include <wordexp.h>
#include <string.h>
int main() {
  char *p = strdup("L${a:");
  wordexp_t w;
  wordexp(p, &w, 0);
}

==26576== Invalid read of size 1
==26576==    at 0x4F1DEB4: parse_param (wordexp.c:1366)
==26576==    by 0x4F1DEB4: parse_dollars (wordexp.c:2102)
==26576==    by 0x4F1FFEB: wordexp (wordexp.c:2348)
==26576==    by 0x4005AA: main (we4.c:6)
==26576==  Address 0x51fb046 is 0 bytes after a block of size 6 alloc'd
==26576==    at 0x4C2ABBD: malloc (vg_replace_malloc.c:296)
==26576==    by 0x4EBE839: strdup (strdup.c:42)
==26576==    by 0x40058E: main (we4.c:4)
==26576== 

(reopening this bug instead of creating a new one for simplicity)

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