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Date:	Sun, 31 Oct 2010 20:10:22 +0300
From:	Vasiliy Kulikov <>
Cc:	Joerg Reuter <>,
	Ralf Baechle <>,
	"David S. Miller" <>,,,
Subject: [PATCH 1/3] net: ax25: fix information leak to userland

Sometimes ax25_getname() doesn't initialize all members of fsa_digipeater
field of fsa struct.  This structure is then copied to userland.  It leads to
leaking of contents of kernel stack memory.  We have to initialize them to zero.

Signed-off-by: Vasiliy Kulikov <>
 net/ax25/af_ax25.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 26eaebf..a324d83 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1392,6 +1392,7 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
 	ax25_cb *ax25;
 	int err = 0;
+	memset(&fsa->fsa_digipeater, 0, sizeof(fsa->fsa_digipeater));
 	ax25 = ax25_sk(sk);

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