net: sctp: sctp_setsockopt_auth_key: use kzfree instead of kfree

[ 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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 1f9843ed801b37ba68a23e7964c74b9dfe22adb2..26ffae24a984b2619748774dcd5653787ea6a06c 100644 (file)
--- 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;
 }