commit 1c36e1e6a5b9b6f9ad1c67f5d43383afb4d80339
Author: Dmitry V. Levin <ldv@altlinux.org>
Date:   Wed Dec 20 11:27:51 2017 +0000

    elf: remove redundant code from is_dst
    
    is_dst is called either by _dl_dst_count or by _dl_dst_substitute.
    _dl_dst_count is called by DL_DST_COUNT only.
    DL_DST_COUNT is called either by expand_dst with is_path == 0
    or by expand_dynamic_string_token.
    _dl_dst_substitute is called either from expand_dst with is_path == 0
    or from expand_dynamic_string_token.
    The latter function is called either from _dl_map_object with is_path == 0
    or from fillin_rpath with is_path == 1 and name containing no ':'.
    
    In any case (is_path && name[i] == ':') is always false and all code
    depending on it can be safely removed.
    
    * elf/dl-load.c (is_dst): Remove checks that is_path is set and name
    contains ':', and all code depending on these checks.

Index: glibc-2.17-c758a686/elf/dl-load.c
===================================================================
--- glibc-2.17-c758a686.orig/elf/dl-load.c
+++ glibc-2.17-c758a686/elf/dl-load.c
@@ -258,14 +258,12 @@ is_dst (const char *start, const char *n
       /* Skip over closing curly brace and adjust for the --name.  */
       len += 2;
     }
-  else if (name[len] != '\0' && name[len] != '/'
-	   && (!is_path || name[len] != ':'))
+  else if (name[len] != '\0' && name[len] != '/')
     return 0;
 
   if (__builtin_expect (secure, 0)
-      && ((name[len] != '\0' && name[len] != '/'
-	   && (!is_path || name[len] != ':'))
-	  || (name != start + 1 && (!is_path || name[-2] != ':'))))
+      && ((name[len] != '\0' && name[len] != '/')
+	  || (name != start + 1)))
     return 0;
 
   return len;