Repository : ssh://git@open-mesh.org/batman-adv

On branch : maint

commit 32bcb3f6e3cf92d9c1d19f0d254c094c119da811 Author: Sven Eckelmann sven@narfation.org Date: Mon Feb 22 22:56:33 2016 +0100

batman-adv: Fix unexpected free of bcast_own on add_if error

The function batadv_iv_ogm_orig_add_if allocates new buffers for bcast_own and bcast_own_sum. It is expected that these buffers are unchanged in case either bcast_own or bcast_own_sum couldn't be resized.

But the error handling of this function frees the already resized buffer for bcast_own when the allocation of the new bcast_own_sum buffer failed. This will lead to an invalid memory access when some code will try to access bcast_own.

Instead the resized new bcast_own buffer has to be kept. This will not lead to problems because the size of the buffer was only increased and therefore no user of the buffer will try to access bytes outside of the new buffer.

Fixes: fdafa7d29ace ("batman-adv: provide orig_node routing API") Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

32bcb3f6e3cf92d9c1d19f0d254c094c119da811 net/batman-adv/bat_iv_ogm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index a6d389b..ea553fe 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -155,10 +155,8 @@ static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, orig_node->bat_iv.bcast_own = data_ptr;

data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); - if (!data_ptr) { - kfree(orig_node->bat_iv.bcast_own); + if (!data_ptr) goto unlock; - }

memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, (max_if_num - 1) * sizeof(u8));