From: Karel Zak <kzak@redhat.com>
Date: Mon, 29 May 2017 11:25:36 +0000 (+0200)
Subject: wall: make sure with not referencing a null pointer
X-Git-Tag: v2.30~37
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4cb2b48f9ad7dc2fe925ea23ccc8dba24260c9e;p=thirdparty%2Futil-linux.git

wall: make sure with not referencing a null pointer

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/term-utils/wall.c b/term-utils/wall.c
index 6dec05c12b..a9dde15beb 100644
--- a/term-utils/wall.c
+++ b/term-utils/wall.c
@@ -147,6 +147,9 @@ static int is_gr_member(const char *login, const struct group_workspace *buf)
 	int rc;
 
 	pw = getpwnam(login);
+	if (!pw)
+		return 0;
+
 	if (buf->requested_group == pw->pw_gid)
 		return 1;