WARNING in apparmor_cred_free

[Casey Schaufler]

>From 1a2a99f3cfd069baf9aa0ef91529558bcbe64c14 Mon Sep 17 00:00:00 2001
From: Casey Schaufler <casey at schaufler-ca.com>
Date: Fri, 11 Jan 2019 17:37:56 -0800
Subject: [PATCH 2/2] AppArmor: Fix credential blob assertions

The assertions for NULL credential blobs don't take blob
offsetting into account. Check the raw data, not th eoffset value.

Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
 security/apparmor/include/cred.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/include/cred.h b/security/apparmor/include/cred.h
index b9504a05fddc..29cef1b5687c 100644
--- a/security/apparmor/include/cred.h
+++ b/security/apparmor/include/cred.h
@@ -27,7 +27,7 @@ static inline struct aa_label *cred_label(const struct cred *cred)
 {
 	struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
 
-	AA_BUG(!blob);
+	AA_BUG(!cred->security);
 	return *blob;
 }
 
@@ -36,7 +36,7 @@ static inline void set_cred_label(const struct cred *cred,
 {
 	struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
 
-	AA_BUG(!blob);
+	AA_BUG(!cred->security);
 	*blob = label;
 }
 
-- 
2.20.1