Repository : ssh://git@open-mesh.org/batman-adv
On branch : maint
commit cee103946bb05db00e351cf8b5dee9c8aed8d5f8 Author: Sven Eckelmann sven@narfation.org Date: Sun Nov 29 01:48:57 2015 +0100
batman-adv: Fix invalid read while copying bat_iv.bcast_own
batadv_iv_ogm_orig_del_if removes a part of the bcast_own which previously belonged to the now removed interface. This is done by copying all data which comes before the removed interface and then appending all the data which comes after the removed interface.
The address calculation for the position of the data which comes after the removed interface assumed that the bat_iv.bcast_own is a pointer to a single byte datatype. But it is a pointer to unsigned long and thus the calculated position was wrong off factor sizeof(unsigned long).
Fixes: 83a8342678a0 ("more basic routing code added (forwarding packets / bitarray added)")
Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Marek Lindner mareklindner@neomailbox.ch
cee103946bb05db00e351cf8b5dee9c8aed8d5f8 net/batman-adv/bat_iv_ogm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 912d9c3..aa94b4e 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -185,7 +185,8 @@ unlock: static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, int max_if_num, int del_if_num) { - int chunk_size, ret = -ENOMEM, if_offset; + int ret = -ENOMEM; + size_t chunk_size, if_offset; void *data_ptr = NULL;
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); @@ -203,8 +204,9 @@ static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
/* copy second part */ + if_offset = (del_if_num + 1) * chunk_size; memcpy((char *)data_ptr + del_if_num * chunk_size, - orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size), + (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, (max_if_num - del_if_num) * chunk_size);
free_bcast_own: