From a757b458ffb4fb9a40bcbb4f7869449431c67f83 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Rigault?= <frigo@amadeus.com>
Date: Mon, 1 Nov 2021 13:54:25 +0100
Subject: [PATCH] groupdel: fix SIGSEGV when passwd does not exist

When using groupdel with a prefix, groupdel will attempt to read a
passwd file to look for any user in the group. When the file does not
exist it cores with segmentation fault.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1986111
---
 libmisc/prefix_flag.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libmisc/prefix_flag.c b/libmisc/prefix_flag.c
index cca553a5..b6628ac4 100644
--- a/libmisc/prefix_flag.c
+++ b/libmisc/prefix_flag.c
@@ -288,6 +288,9 @@ extern struct passwd* prefix_getpwent()
 	if (!passwd_db_file) {
 		return getpwent();
 	}
+	if (!fp_pwent) {
+		return NULL;
+	}
 	return fgetpwent(fp_pwent);
 }
 extern void prefix_endpwent()