linux-kernel - [PATCH 5.5 174/399] selinux: ensure we cleanup the internal AVC counters on error in avc

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Message-Id: <20200221072419.566662004@linuxfoundation.org>
Date:   Fri, 21 Feb 2020 08:38:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jaihind Yadav <jaihindyadav@...eaurora.org>,
        Ravi Kumar Siddojigari <rsiddoji@...eaurora.org>,
        Paul Moore <paul@...l-moore.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 174/399] selinux: ensure we cleanup the internal AVC counters on error in avc_update()

From: Jaihind Yadav <jaihindyadav@...eaurora.org>

[ Upstream commit 030b995ad9ece9fa2d218af4429c1c78c2342096 ]

In AVC update we don't call avc_node_kill() when avc_xperms_populate()
fails, resulting in the avc->avc_cache.active_nodes counter having a
false value.  In last patch this changes was missed , so correcting it.

Fixes: fa1aa143ac4a ("selinux: extended permissions for ioctls")
Signed-off-by: Jaihind Yadav <jaihindyadav@...eaurora.org>
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@...eaurora.org>
[PM: merge fuzz, minor description cleanup]
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/selinux/avc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 6646300f7ccb2..d18cb32a242ae 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -891,7 +891,7 @@ static int avc_update_node(struct selinux_avc *avc,
 	if (orig->ae.xp_node) {
 		rc = avc_xperms_populate(node, orig->ae.xp_node);
 		if (rc) {
-			kmem_cache_free(avc_node_cachep, node);
+			avc_node_kill(avc, node);
 			goto out_unlock;
 		}
 	}
-- 
2.20.1