From: Nicolas de Pesloüan Date: Thu, 15 Jul 2010 01:24:54 +0000 (-0700) Subject: bonding: fix a buffer overflow in bonding_show_queue_id. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=79236680bde29913dc6bfaf9165973b74223d5f7;p=linux-beck.git bonding: fix a buffer overflow in bonding_show_queue_id. The test for buffer overflow ensures we have room for 6 more bytes. sprintf, called with %s:%d, slave->dev->name, slave->queue_id may yield far more than 6 bytes. The correct test is res > (PAGE_SIZE - IFNAMSIZ - 6) . Signed-off-by: Nicolas de Pesloüan Signed-off-by: David S. Miller --- diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index f9a034361a8e..1a9976487099 100644 --- a/drivers/net/bonding/bond_sysfs.c +++ b/drivers/net/bonding/bond_sysfs.c @@ -1427,8 +1427,8 @@ static ssize_t bonding_show_queue_id(struct device *d, read_lock(&bond->lock); bond_for_each_slave(bond, slave, i) { - if (res > (PAGE_SIZE - 6)) { - /* not enough space for another interface name */ + if (res > (PAGE_SIZE - IFNAMSIZ - 6)) { + /* not enough space for another interface_name:queue_id pair */ if ((PAGE_SIZE - res) > 10) res = PAGE_SIZE - 10; res += sprintf(buf + res, "++more++ ");