From: John Johansen <john.johansen@canonical.com>
Date: Thu, 6 Apr 2017 13:55:22 +0000 (-0700)
Subject: apparmor: fix invalid reference to index variable of iterator line 836
X-Git-Tag: v4.14-rc2~6^2~116
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b9b144bcafbdd53f68e227968009327b76db08a4;p=platform%2Fkernel%2Flinux-exynos.git

apparmor: fix invalid reference to index variable of iterator line 836

Once the loop on lines 836-853 is complete and exits normally, ent is a
pointer to the dummy list head value.  The derefernces accessible from eg
the goto fail on line 860 or the various goto fail_lock's afterwards thus
seem incorrect.

Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
---

diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index def1fbd..cf9d670 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -876,9 +876,11 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
 	if (ns_name) {
 		ns = aa_prepare_ns(view, ns_name);
 		if (IS_ERR(ns)) {
+			op = OP_PROF_LOAD;
 			info = "failed to prepare namespace";
 			error = PTR_ERR(ns);
 			ns = NULL;
+			ent = NULL;
 			goto fail;
 		}
 	} else
@@ -1013,7 +1015,7 @@ fail_lock:
 	/* audit cause of failure */
 	op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
 fail:
-	audit_policy(profile, op, ns_name, ent->new->base.hname,
+	audit_policy(profile, op, ns_name, ent ? ent->new->base.hname : NULL,
 		     info, error);
 	/* audit status that rest of profiles in the atomic set failed too */
 	info = "valid profile in failed atomic policy load";
@@ -1023,7 +1025,7 @@ fail:
 			/* skip entry that caused failure */
 			continue;
 		}
-		op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
+		op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL;
 		audit_policy(profile, op, ns_name,
 			     tmp->new->base.hname, info, error);
 	}