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Bluetooth: L2CAP - Fix info leak via getsockname()

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The L2CAP code fails to initialize the l2_bdaddr_type member of struct
sockaddr_l2 and the padding byte added for alignment. It that for leaks
two bytes kernel stack via the getsockname() syscall. Add an explicit
memset(0) before filling the structure to avoid the info leak.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mathias Krause 2012-08-15 11:31:51 +00:00 committed by David S. Miller
parent 9344a97296
commit 792039c73c
1 changed files with 1 additions and 0 deletions
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net/bluetooth/l2cap_sock.c
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@ -245,6 +245,7 @@ static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *l
BT_DBG("sock %p, sk %p", sock, sk);
memset(la, 0, sizeof(struct sockaddr_l2));
addr->sa_family = AF_BLUETOOTH;
*len = sizeof(struct sockaddr_l2);