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| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:49 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-07 16:28:00 -0400 |
| commit | 4683f42fde3977bdb4e8a09622788cc8b5313778 (patch) | |
| tree | 37e0e2bd2666e7bcedd6630b029d88f740b3ddc7 /net/bluetooth | |
| parent | ef3313e84acbf349caecae942ab3ab731471f1a1 (diff) | |
| download | linux-4683f42fde3977bdb4e8a09622788cc8b5313778.tar.gz linux-4683f42fde3977bdb4e8a09622788cc8b5313778.tar.bz2 linux-4683f42fde3977bdb4e8a09622788cc8b5313778.zip | |
Bluetooth: fix possible info leak in bt_sock_recvmsg()
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>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/af_bluetooth.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c index d3ee69b35a78..0d1b08cc76e1 100644 --- a/net/bluetooth/af_bluetooth.c +++ b/net/bluetooth/af_bluetooth.c @@ -230,6 +230,8 @@ int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, if (flags & (MSG_OOB)) return -EOPNOTSUPP; + msg->msg_namelen = 0; + skb = skb_recv_datagram(sk, flags, noblock, &err); if (!skb) { if (sk->sk_shutdown & RCV_SHUTDOWN) @@ -237,8 +239,6 @@ int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, return err; } - msg->msg_namelen = 0; - copied = skb->len; if (len < copied) { msg->msg_flags |= MSG_TRUNC; |