Check setuid() return value. Bugzilla #7116.

1 files changed, 4 insertions, 1 deletions

diff --git a/xinit.c b/xinit.c
index 956d78a..818f754 100644
--- a/xinit.c
+++ b/xinit.c
@@ -692,7 +692,10 @@ static int
 startClient(char *client[])
 {
 	if ((clientpid = vfork()) == 0) {
-		setuid(getuid());
+		if (setuid(getuid()) == -1) {
+			Error("cannot change uid: %s\n", strerror(errno));
+			_exit(ERR_EXIT);
+		}
 		setpgrp(0, getpid());
 		environ = newenviron;
 #ifdef __UNIXOS2__