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);