From fb96eb24455f4ea501c873ba68d07ecb61ce28d6 Mon Sep 17 00:00:00 2001
From: "Todd C. Miller" <Todd.Miller@courtesan.com>
Date: Mon, 14 Jul 2014 09:56:38 -0600
Subject: [PATCH] Error out if sesh is run as a login shell but the shell it
 needs to run has no slash.  This shouldn't happen in practice.

---
 src/sesh.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/sesh.c b/src/sesh.c
index 86d8c0962..d939f1b47 100644
--- a/src/sesh.c
+++ b/src/sesh.c
@@ -74,9 +74,10 @@ main(int argc, char *argv[], char *envp[])
 
     /* If invoked as a login shell, modify argv[0] accordingly. */
     if (login_shell) {
-	if ((cp = strrchr(argv[0], '/')) != NULL)
-	    argv[0] = cp;
-	argv[0][0] = '-';
+	if ((cp = strrchr(argv[0], '/')) == NULL)
+	    sudo_fatal(U_("unable to run %s as a login shell"), argv[0]);
+	*cp = '-';
+	argv[0] = cp;
     }
     sudo_execve(cmnd, argv, envp, noexec);
     sudo_warn(U_("unable to execute %s"), cmnd);