openwrt-packages/utils/bash/patches/103-upstream-bash42-003.patch

			     BASH PATCH REPORT
			     =================

Bash-Release:	4.2
Patch-ID:	bash42-003

Bug-Reported-by:	Clark J. Wang <dearvoid@gmail.com>
Bug-Reference-ID:	<AANLkTikZ_rVV-frR8Fh0PzhXnMKnm5XsUR-F3qtPPs5G@mail.gmail.com>
Bug-Reference-URL:	http://lists.gnu.org/archive/html/bug-bash/2011-02/msg00136.html

Bug-Description:

When using the pattern replacement and pattern removal word expansions, bash
miscalculates the possible match length in the presence of an unescaped left
bracket without a closing right bracket, resulting in a failure to match
the pattern.

Patch (apply with `patch -p0'):

--- a/lib/glob/gmisc.c
+++ b/lib/glob/gmisc.c
@@ -77,8 +77,8 @@ wmatchlen (wpat, wmax)
      wchar_t *wpat;
      size_t wmax;
 {
-  wchar_t wc, *wbrack;
-  int matlen, t, in_cclass, in_collsym, in_equiv;
+  wchar_t wc;
+  int matlen, bracklen, t, in_cclass, in_collsym, in_equiv;
 
   if (*wpat == 0)
     return (0);
@@ -118,58 +118,80 @@ wmatchlen (wpat, wmax)
 	  break;
 	case L'[':
 	  /* scan for ending `]', skipping over embedded [:...:] */
-	  wbrack = wpat;
+	  bracklen = 1;
 	  wc = *wpat++;
 	  do
 	    {
 	      if (wc == 0)
 		{
-	          matlen += wpat - wbrack - 1;	/* incremented below */
-	          break;
+		  wpat--;			/* back up to NUL */
+	          matlen += bracklen;
+	          goto bad_bracket;
 	        }
 	      else if (wc == L'\\')
 		{
-		  wc = *wpat++;
-		  if (*wpat == 0)
-		    break;
+		  /* *wpat == backslash-escaped character */
+		  bracklen++;
+		  /* If the backslash or backslash-escape ends the string,
+		     bail.  The ++wpat skips over the backslash escape */
+		  if (*wpat == 0 || *++wpat == 0)
+		    {
+		      matlen += bracklen;
+		      goto bad_bracket;
+		    }
 		}
 	      else if (wc == L'[' && *wpat == L':')	/* character class */
 		{
 		  wpat++;
+		  bracklen++;
 		  in_cclass = 1;
 		}
 	      else if (in_cclass && wc == L':' && *wpat == L']')
 		{
 		  wpat++;
+		  bracklen++;
 		  in_cclass = 0;
 		}
 	      else if (wc == L'[' && *wpat == L'.')	/* collating symbol */
 		{
 		  wpat++;
+		  bracklen++;
 		  if (*wpat == L']')	/* right bracket can appear as collating symbol */
-		    wpat++;
+		    {
+		      wpat++;
+		      bracklen++;
+		    }
 		  in_collsym = 1;
 		}
 	      else if (in_collsym && wc == L'.' && *wpat == L']')
 		{
 		  wpat++;
+		  bracklen++;
 		  in_collsym = 0;
 		}
 	      else if (wc == L'[' && *wpat == L'=')	/* equivalence class */
 		{
 		  wpat++;
+		  bracklen++;
 		  if (*wpat == L']')	/* right bracket can appear as equivalence class */
-		    wpat++;
+		    {
+		      wpat++;
+		      bracklen++;
+		    }
 		  in_equiv = 1;
 		}
 	      else if (in_equiv && wc == L'=' && *wpat == L']')
 		{
 		  wpat++;
+		  bracklen++;
 		  in_equiv = 0;
 		}
+	      else
+		bracklen++;
 	    }
 	  while ((wc = *wpat++) != L']');
 	  matlen++;		/* bracket expression can only match one char */
+bad_bracket:
 	  break;
 	}
     }
@@ -213,8 +235,8 @@ umatchlen (pat, max)
      char *pat;
      size_t max;
 {
-  char c, *brack;
-  int matlen, t, in_cclass, in_collsym, in_equiv;
+  char c;
+  int matlen, bracklen, t, in_cclass, in_collsym, in_equiv;
 
   if (*pat == 0)
     return (0);
@@ -254,58 +276,80 @@ umatchlen (pat, max)
 	  break;
 	case '[':
 	  /* scan for ending `]', skipping over embedded [:...:] */
-	  brack = pat;
+	  bracklen = 1;
 	  c = *pat++;
 	  do
 	    {
 	      if (c == 0)
 		{
-	          matlen += pat - brack - 1;	/* incremented below */
-	          break;
+		  pat--;			/* back up to NUL */
+		  matlen += bracklen;
+		  goto bad_bracket;
 	        }
 	      else if (c == '\\')
 		{
-		  c = *pat++;
-		  if (*pat == 0)
-		    break;
+		  /* *pat == backslash-escaped character */
+		  bracklen++;
+		  /* If the backslash or backslash-escape ends the string,
+		     bail.  The ++pat skips over the backslash escape */
+		  if (*pat == 0 || *++pat == 0)
+		    {
+		      matlen += bracklen;
+		      goto bad_bracket;
+		    }
 		}
 	      else if (c == '[' && *pat == ':')	/* character class */
 		{
 		  pat++;
+		  bracklen++;
 		  in_cclass = 1;
 		}
 	      else if (in_cclass && c == ':' && *pat == ']')
 		{
 		  pat++;
+		  bracklen++;
 		  in_cclass = 0;
 		}
 	      else if (c == '[' && *pat == '.')	/* collating symbol */
 		{
 		  pat++;
+		  bracklen++;
 		  if (*pat == ']')	/* right bracket can appear as collating symbol */
-		    pat++;
+		    {
+		      pat++;
+		      bracklen++;
+		    }
 		  in_collsym = 1;
 		}
 	      else if (in_collsym && c == '.' && *pat == ']')
 		{
 		  pat++;
+		  bracklen++;
 		  in_collsym = 0;
 		}
 	      else if (c == '[' && *pat == '=')	/* equivalence class */
 		{
 		  pat++;
+		  bracklen++;
 		  if (*pat == ']')	/* right bracket can appear as equivalence class */
-		    pat++;
+		    {
+		      pat++;
+		      bracklen++;
+		    }
 		  in_equiv = 1;
 		}
 	      else if (in_equiv && c == '=' && *pat == ']')
 		{
 		  pat++;
+		  bracklen++;
 		  in_equiv = 0;
 		}
+	      else
+		bracklen++;
 	    }
 	  while ((c = *pat++) != ']');
 	  matlen++;		/* bracket expression can only match one char */
+bad_bracket:
 	  break;
 	}
     }
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 2
+#define PATCHLEVEL 3
 
 #endif /* _PATCHLEVEL_H_ */