apparmor: fix arg_size computation for when setprocattr is null terminated

Signed-off-by: John Johansen <john.johansen@canonical.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index c6921a0145ed..3be30c701bfa 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -529,7 +529,7 @@ static int apparmor_setprocattr(struct task_struct *task, char *name,
         if (!*args)
                 goto out;
 
-        arg_size = size - (args - (char *) value);
+        arg_size = size - (args - (largs ? largs : (char *) value));
         if (strcmp(name, "current") == 0) {
                 if (strcmp(command, "changehat") == 0) {
                         error = aa_setprocattr_changehat(args, arg_size,