linux-kernel - [ 161/171] libceph: fix crypto key null deref, memory leak

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Message-Id: <20121122004049.514910817@linuxfoundation.org>
Date:	Wed, 21 Nov 2012 16:41:47 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Sylvain Munaut <tnt@...tNt.com>,
	Sage Weil <sage@...tank.com>, Alex Elder <elder@...tank.com>
Subject: [ 161/171] libceph: fix crypto key null deref, memory leak

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sylvain Munaut <tnt@...tNt.com>

(cherry picked from commit f0666b1ac875ff32fe290219b150ec62eebbe10e)

Avoid crashing if the crypto key payload was NULL, as when it was not correctly
allocated and initialized.  Also, avoid leaking it.

Signed-off-by: Sylvain Munaut <tnt@...tNt.com>
Signed-off-by: Sage Weil <sage@...tank.com>
Reviewed-by: Alex Elder <elder@...tank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ceph/crypto.c |    1 +
 net/ceph/crypto.h |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -466,6 +466,7 @@ void ceph_key_destroy(struct key *key) {
 	struct ceph_crypto_key *ckey = key->payload.data;
 
 	ceph_crypto_key_destroy(ckey);
+	kfree(ckey);
 }
 
 struct key_type key_type_ceph = {
--- a/net/ceph/crypto.h
+++ b/net/ceph/crypto.h
@@ -16,7 +16,8 @@ struct ceph_crypto_key {
 
 static inline void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
 {
-	kfree(key->key);
+	if (key)
+		kfree(key->key);
 }
 
 extern int ceph_crypto_key_clone(struct ceph_crypto_key *dst,


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