- Fixed a cosmetic bug where pretty-printing valid domain-search options would

result in an erroneous error log message ('garbage in format string').
  [ISC-Bugs #19327]

RELNOTES

@@ -75,6 +75,9 @@ work on other platforms. Please report any problems and suggested fixes to
 - Two uninitialized stack structures are now memset to zero, thanks to a
   patch from David Cantrell at RedHat.
 
+- Fixed a cosmetic bug where pretty-printing valid domain-search options would
+  result in an erroneous error log message ('garbage in format string').
+
 			Changes since 4.1.0b1
 
 - A missing "else" in dhcrelay.c could have caused an interface not to

common/options.c

@@ -1730,12 +1730,27 @@ const char *pretty_print_option (option, data, len, emit_commas, emit_quotes)
 			}
 			fmtbuf [l + 1] = 0;
 			break;
+		      case 'c':
+			/* The 'c' atom is a 'D' modifier only. */
+			log_error("'c' atom not following D atom in format "
+				  "string: %s", option->format);
+			break;
+		      case 'D':
+			/*
+			 * Skip the 'c' atom, if present.  It does not affect
+			 * how we convert wire->text format (if compression is
+			 * present either way, we still process it).
+			 */
+			if (option->format[i+1] == 'c')
+				i++;
+			fmtbuf[l + 1] = 0;
+			numhunk = -2;
+			break;
 		      case 'd':
 			fmtbuf[l] = 't';
 			/* Fall Through ! */
 		      case 't':
-		      case 'D':
+			fmtbuf[l + 1] = 0;
-			fmtbuf [l + 1] = 0;
 			numhunk = -2;
 			break;
 		      case 'N':