Each net_device in a system will automatically managed as a possible batman_if and holds different informations like a buffer with a prepared originator messages. To reduce the memory usage, the packet_buff will only be allocated when the interface is really added/enabled for batman-adv.

The function to update the hw address information inside the packet_buff just assumes that the packet_buff is always initialised and thus the kernel will just oops when we try to change the hw address of a not already fully enabled interface.

We must always check if the packet_buff is allocated before we try to change information inside of it.

Reported-by: Tim Glaremin Tim.Glaremin@web.de Reported-by: Lemonde zukky@bb.banban.jp Signed-off-by: Sven Eckelmann sven.eckelmann@gmx.de Cc: stable stable@kernel.org Signed-off-by: Sven Eckelmann sven.eckelmann@gmx.de --- batman-adv/hard-interface.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/batman-adv/hard-interface.c b/batman-adv/hard-interface.c index eb26026..9d0a47c 100644 --- a/batman-adv/hard-interface.c +++ b/batman-adv/hard-interface.c @@ -138,6 +138,9 @@ static bool hardif_is_iface_up(struct batman_if *batman_if)

static void update_mac_addresses(struct batman_if *batman_if) { + if (!batman_if || !batman_if->packet_buff) + return; + addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);

memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig, @@ -397,6 +400,7 @@ static struct batman_if *hardif_add_interface(struct net_device *net_dev) batman_if->net_dev = net_dev; batman_if->soft_iface = NULL; batman_if->if_status = IF_NOT_IN_USE; + batman_if->packet_buff = NULL; INIT_LIST_HEAD(&batman_if->list);

check_known_mac_addr(batman_if->net_dev->dev_addr);