linux-kernel - [PATCH 5.3 092/197] LSM: SafeSetID: Stop releasing uninitialized ruleset

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Message-Id: <20191027203356.718370614@linuxfoundation.org>
Date:   Sun, 27 Oct 2019 22:00:10 +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, Jann Horn <jannh@...gle.com>,
        Micah Morton <mortonm@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.3 092/197] LSM: SafeSetID: Stop releasing uninitialized ruleset

From: Micah Morton <mortonm@...omium.org>

[ Upstream commit 21ab8580b383f27b7f59b84ac1699cb26d6c3d69 ]

The first time a rule set is configured for SafeSetID, we shouldn't be
trying to release the previously configured ruleset, since there isn't
one. Currently, the pointer that would point to a previously configured
ruleset is uninitialized on first rule set configuration, leading to a
crash when we try to call release_ruleset with that pointer.

Acked-by: Jann Horn <jannh@...gle.com>
Signed-off-by: Micah Morton <mortonm@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/safesetid/securityfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/safesetid/securityfs.c b/security/safesetid/securityfs.c
index d568e17dd7739..74a13d432ed80 100644
--- a/security/safesetid/securityfs.c
+++ b/security/safesetid/securityfs.c
@@ -187,7 +187,8 @@ static ssize_t handle_policy_update(struct file *file,
 out_free_buf:
 	kfree(buf);
 out_free_pol:
-	release_ruleset(pol);
+	if (pol)
+                release_ruleset(pol);
 	return err;
 }
 
-- 
2.20.1