wall: make sure with not referencing a null pointer

Signed-off-by: Karel Zak <kzak@redhat.com>
2017-05-29 13:25:36 +02:00 · 2017-05-29 13:25:36 +02:00 · b4cb2b48f9
parent 2e2cfdae79
commit b4cb2b48f9
1 changed files with 3 additions and 0 deletions
--- 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;