From: Greg Hudson <ghudson@mit.edu>
Date: Tue, 24 Apr 2018 18:31:35 +0000 (-0400)
Subject: Check for zero argc in ksu
X-Git-Tag: krb5-1.17-beta1~135
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5b0a998d6349f8c90821a347db5666aed0e50eb;p=thirdparty%2Fkrb5.git

Check for zero argc in ksu

Most programs in the tree will perform a null dereference when argc is
zero, but as a setuid program ksu should be extra careful about memory
errors, even if this one is harmless.  Check and exit with status 1
immediately.

ticket: 8661
---

diff --git a/src/clients/ksu/main.c b/src/clients/ksu/main.c
index 7ff676ca72..5e79ef5f42 100644
--- a/src/clients/ksu/main.c
+++ b/src/clients/ksu/main.c
@@ -138,6 +138,8 @@ main (argc, argv)
         exit(1);
     }
 
+    if (argc == 0)
+        exit(1);
     if (strrchr(argv[0], '/'))
         argv[0] = strrchr(argv[0], '/')+1;
     prog_name = argv[0];