linux-kernel - [ 164/184] net: sctp: sctp_setsockopt_auth

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Message-Id: <20130604172137.099416389@1wt.eu>
Date:	Tue, 04 Jun 2013 19:24:14 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 164/184] net: sctp: sctp_setsockopt_auth_key: use kzfree

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
 instead of kfree

From: Daniel Borkmann <dborkman@...hat.com>

[ Upstream commit 6ba542a291a5e558603ac51cda9bded347ce7627 ]

In sctp_setsockopt_auth_key, we create a temporary copy of the user
passed shared auth key for the endpoint or association and after
internal setup, we free it right away. Since it's sensitive data, we
should zero out the key before returning the memory back to the
allocator. Thus, use kzfree instead of kfree, just as we do in
sctp_auth_key_put().

Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/sctp/socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 1f9843e..26ffae2 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3271,7 +3271,7 @@ static int sctp_setsockopt_auth_key(struct sock *sk,
 
 	ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
 out:
-	kfree(authkey);
+	kzfree(authkey);
 	return ret;
 }
 
-- 
1.7.12.2.21.g234cd45.dirty



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