BASH PATCH REPORT ================= Bash-Release: 4.2 Patch-ID: bash42-028 Bug-Reported-by: Mark Edgar Bug-Reference-ID: Bug-Reference-URL: http://lists.gnu.org/archive/html/bug-bash/2012-03/msg00109.html Bug-Description: When using a word expansion for which the right hand side is evaluated, certain expansions of quoted null strings include spurious ^? characters. Patch (apply with `patch -p0'): *** ../bash-4.2-patched/subst.c 2012-03-11 17:35:13.000000000 -0400 --- subst.c 2012-03-20 19:30:13.000000000 -0400 *************** *** 5810,5813 **** --- 5810,5823 ---- if (qdollaratp && ((hasdol && quoted) || l->next)) *qdollaratp = 1; + /* If we have a quoted null result (QUOTED_NULL(temp)) and the word is + a quoted null (l->next == 0 && QUOTED_NULL(l->word->word)), the + flags indicate it (l->word->flags & W_HASQUOTEDNULL), and the + expansion is quoted (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) + (which is more paranoia than anything else), we need to return the + quoted null string and set the flags to indicate it. */ + if (l->next == 0 && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && QUOTED_NULL(temp) && QUOTED_NULL(l->word->word) && (l->word->flags & W_HASQUOTEDNULL)) + { + w->flags |= W_HASQUOTEDNULL; + } dispose_words (l); } *** ../bash-4.2-patched/patchlevel.h Sat Jun 12 20:14:48 2010 --- patchlevel.h Thu Feb 24 21:41:34 2011 *************** *** 26,30 **** looks for to find the patch level (for the sccs version string). */ ! #define PATCHLEVEL 27 #endif /* _PATCHLEVEL_H_ */ --- 26,30 ---- looks for to find the patch level (for the sccs version string). */ ! #define PATCHLEVEL 28 #endif /* _PATCHLEVEL_H_ */