Add upstream patch for new return-code for bad usernames

debian/patches/series

@@ -10,3 +10,4 @@ debian/Adapt-login.defs-for-Debian.patch
 debian/Define-LOGIN_NAME_MAX-on-HURD.patch
 debian/Stop-building-programs-we-do-not-install.patch
 upstream/lib-user_busy.c-Include-utmpx.h.patch
+upstream/a015e919834c90b99947829c6c823f7fe93a8097-E_BAD_NAME.patch

debian/patches/upstream/a015e919834c90b99947829c6c823f7fe93a8097-E_BAD_NAME.patch

@@ -0,0 +1,39 @@
+From a015e919834c90b99947829c6c823f7fe93a8097 Mon Sep 17 00:00:00 2001
+From: Alejandro Colomar <alx@kernel.org>
+Date: Thu, 5 Dec 2024 17:38:54 +0100
+Subject: [PATCH] src/useradd.c: E_BAD_NAME: Use a different error code for bad
+ login names
+
+Wrappers like adduser(8) want to do their own stuff if the login name is
+bad.  For that, they need to be able to differentiate such an error.
+
+Closes: <https://github.com/shadow-maint/shadow/issues/1103>
+Suggested-by: Chris Hofstaedtler <zeha@debian.org>
+Cc: Marc 'Zugschlus' Haber <mh+githubvisible@zugschlus.de>
+Signed-off-by: Alejandro Colomar <alx@kernel.org>
+Bug-Debian: 1074306
+---
+ src/useradd.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/useradd.c b/src/useradd.c
+index 891fd1420..d8429eecb 100644
+--- a/src/useradd.c
++++ b/src/useradd.c
+@@ -201,6 +201,7 @@ static bool home_added = false;
+ #define E_SUB_UID_UPDATE 16	/* can't update the subordinate uid file */
+ #define E_SUB_GID_UPDATE 18	/* can't update the subordinate gid file */
+ #endif				/* ENABLE_SUBIDS */
++#define E_BAD_NAME	19	/* Bad login name */
+ 
+ #define DGROUP			"GROUP"
+ #define DGROUPS			"GROUPS"
+@@ -1549,7 +1550,7 @@ static void process_flags (int argc, char **argv)
+ 			              user_name, AUDIT_NO_ID,
+ 			              SHADOW_AUDIT_FAILURE);
+ #endif
+-			exit (E_BAD_ARG);
++			exit (E_BAD_NAME);
+ 		}
+ 		if (!dflg) {
+ 			char  *uh;