From 9df42871ff0294b87a332e8c307fa49daed67ccf Mon Sep 17 00:00:00 2001
From: Felix Schulze <39433012+thefeli73@users.noreply.github.com>
Date: Sat, 29 Jan 2022 16:07:55 +0100
Subject: [PATCH] check for return values!!!

---
 lab1/login_linux.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/lab1/login_linux.c b/lab1/login_linux.c
index 1b2d4cd..b97f329 100755
--- a/lab1/login_linux.c
+++ b/lab1/login_linux.c
@@ -91,20 +91,27 @@ int main(int argc, char *argv[]) {
 				printf(" You're in !\n");
 				passwddata->pwfailed = 0;
 				passwddata->pwage = passwddata->pwage + 1;
-				mysetpwent(user, passwddata);
+				if (mysetpwent(user, passwddata) < 0) {     /* execute the command  */
+					perror("Error");exit(EXIT_FAILURE);
+				}
 				if (passwddata->pwage > 100) {
 					printf(" Your password is OLD!!!!\n");
 				} 
 				
 				/*  check UID, see setuid(2) */
-				setuid(passwddata->uid);
+				
+				if (setuid(passwddata->uid) < 0) {     /* execute the command  */
+					perror("Error");exit(EXIT_FAILURE);
+				}
 				/*  start a shell, use execve(2) */
 				if (execve("/bin/bash",NULL,NULL) < 0) {     /* execute the command  */
 					perror("Error");exit(EXIT_FAILURE);
 				}
 			} else {
 				passwddata->pwfailed = passwddata->pwfailed + 1;
-				mysetpwent(user, passwddata);
+				if (mysetpwent(user, passwddata) < 0) {     /* execute the command  */
+					perror("Error");exit(EXIT_FAILURE);
+				}
 			}
 		}
 		printf("Login Incorrect \n");