commit d084965adc7baa8ea804427cccf973cea556d697
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Mon Jan 24 21:36:41 2022 +0530

    realpath: Avoid overwriting preexisting error (CVE-2021-3998)
    
    Set errno and failure for paths that are too long only if no other error
    occurred earlier.
    
    Related: BZ #28770
    
    Reviewed-by: Andreas Schwab <schwab@linux-m68k.org>
    Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
    (cherry picked from commit 84d2d0fe20bdf94feed82b21b4d7d136db471f03)

diff --git a/stdlib/canonicalize.c b/stdlib/canonicalize.c
index 7a23a51b3a395eb3..e2d4244fc7b8fa25 100644
--- a/stdlib/canonicalize.c
+++ b/stdlib/canonicalize.c
@@ -404,7 +404,7 @@ error:
     {
       if (dest - rname <= get_path_max ())
 	rname = strcpy (resolved, rname);
-      else
+      else if (!failed)
 	{
 	  failed = true;
 	  __set_errno (ENAMETOOLONG);