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Subject[ 102/184] Bluetooth: fix possible info leak in
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
bt_sock_recvmsg()

From: Mathias Krause <minipli@googlemail.com>

In case the socket is already shutting down, bt_sock_recvmsg() returns
with 0 without updating msg_namelen leading to net/socket.c leaking the
local, uninitialized sockaddr_storage variable to userland -- 128 bytes
of kernel stack memory.

Fix this by moving the msg_namelen assignment in front of the shutdown
test.

Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[dannf: adjusted to apply to Debian's 2.6.32]
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
net/bluetooth/af_bluetooth.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 8cfb5a8..d7239dd 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -240,14 +240,14 @@ int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
if (flags & (MSG_OOB))
return -EOPNOTSUPP;

+ msg->msg_namelen = 0;
+
if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
if (sk->sk_shutdown & RCV_SHUTDOWN)
return 0;
return err;
}

- msg->msg_namelen = 0;
-
copied = skb->len;
if (len < copied) {
msg->msg_flags |= MSG_TRUNC;
--
1.7.12.2.21.g234cd45.dirty




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