Bluetooth: bnep: fix buffer overflow
authorVasiliy Kulikov <segoon@openwall.com>
Mon, 14 Feb 2011 10:54:31 +0000 (13:54 +0300)
committerGustavo F. Padovan <padovan@profusion.mobi>
Mon, 14 Feb 2011 14:51:33 +0000 (12:51 -0200)
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>
net/bluetooth/bnep/sock.c

index 2862f53b66b15b8b680322b32c5196f502adc7f0..d935da71ab3b57ff7c46962f339b257f39e57952 100644 (file)
@@ -88,6 +88,7 @@ static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
                        sockfd_put(nsock);
                        return -EBADFD;
                }
+               ca.device[sizeof(ca.device)-1] = 0;
 
                err = bnep_add_connection(&ca, nsock);
                if (!err) {