[075/105] Bluetooth: bnep: fix buffer overflow

Greg KH
2011-04-12T14:45:46Z

From: Vasiliy Kulikov <segoon@openwall.com>

commit 43629f8f5ea32a998d06d1bb41eefa0e821ff573 upstream.

Struct ca is copied from userspace. It is not checked whether the "device"
field is NULL terminated. This potentially leads to BUG() inside of
alloc_netdev_mqs() and/or information leak by creating a device with a name
made of contents of kernel stack.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
net/bluetooth/bnep/sock.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/bluetooth/bnep/sock.c
+++ b/net/bluetooth/bnep/sock.c
@@ -88,6 +88,7 @@ static int bnep_sock_ioctl(struct socket
sockfd_put(nsock);
return -EBADFD;
}
+ ca.device[sizeof(ca.device)-1] = 0;

err = bnep_add_connection(&ca, nsock);
if (!err) {