Commit 79236680 authored by Nicolas de Pesloüan's avatar Nicolas de Pesloüan Committed by David S. Miller

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: default avatarNicolas de Pesloüan <nicolas.2p.debian@free.fr>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 04d5821f
......@@ -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++ ");
......
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