linux-kernel - [PATCH 3.10 119/268] apparmor: fix oops in profile_unpack() when policy

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Message-Id: <1497897167-14556-120-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:30:18 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     John Johansen <john.johansen@...onical.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 119/268] apparmor: fix oops in profile_unpack() when policy_db is not present

From: John Johansen <john.johansen@...onical.com>

commit 5f20fdfed16bc599a325a145bf0123a8e1c9beea upstream.

BugLink: http://bugs.launchpad.net/bugs/1592547

If unpack_dfa() returns NULL due to the dfa not being present,
profile_unpack() is not checking if the dfa is not present (NULL).

Signed-off-by: John Johansen <john.johansen@...onical.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 security/apparmor/policy_unpack.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index 6b22135..55ff3ee 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -571,6 +571,9 @@ static struct aa_profile *unpack_profile(struct aa_ext *e)
 			error = PTR_ERR(profile->policy.dfa);
 			profile->policy.dfa = NULL;
 			goto fail;
+		} else if (!profile->policy.dfa) {
+			error = -EPROTO;
+			goto fail;
 		}
 		if (!unpack_u32(e, &profile->policy.start[0], "start"))
 			/* default start state */
-- 
2.8.0.rc2.1.gbe9624a