path: root/net/hsr/hsr_slave.c
diff options
authorArvid Brodin <arvid.brodin@alten.se>2015-02-27 21:26:03 +0100
committerDavid S. Miller <davem@davemloft.net>2015-03-01 13:40:23 -0500
commit56b08fdcf637955d3023d769afd6cdabc526ba22 (patch)
tree943467a3675031846c69f02325c4bb933320dd09 /net/hsr/hsr_slave.c
parentnet: pasemi: Use setup_timer and mod_timer (diff)
net/hsr: Fix NULL pointer dereference and refcnt bugs when deleting a HSR interface.
To repeat: $ sudo ip link del hsr0 BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: [<ffffffff8187f495>] hsr_del_port+0x15/0xa0 etc... Bug description: As part of the hsr master device destruction, hsr_del_port() is called for each of the hsr ports. At each such call, the master device is updated regarding features and mtu. When the master device is freed before the slave interfaces, master will be NULL in hsr_del_port(), which led to a NULL pointer dereference. Additionally, dev_put() was called on the master device itself in hsr_del_port(), causing a refcnt error. A third bug in the same code path was that the rtnl lock was not taken before hsr_del_port() was called as part of hsr_dev_destroy(). The reporter (Nicolas Dichtel) also said: "hsr_netdev_notify() supposes that the port will always be available when the notification is for an hsr interface. It's wrong. For example, netdev_wait_allrefs() may resend NETDEV_UNREGISTER.". As a precaution against this, a check for port == NULL was added in hsr_dev_notify(). Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Fixes: 51f3c605318b056a ("net/hsr: Move slave init to hsr_slave.c.") Signed-off-by: Arvid Brodin <arvid.brodin@alten.se> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/hsr/hsr_slave.c')
1 files changed, 7 insertions, 3 deletions
diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
index a348dcbcd683..7d37366cc695 100644
--- a/net/hsr/hsr_slave.c
+++ b/net/hsr/hsr_slave.c
@@ -181,8 +181,10 @@ void hsr_del_port(struct hsr_port *port)
if (port != master) {
- netdev_update_features(master->dev);
- dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
+ if (master != NULL) {
+ netdev_update_features(master->dev);
+ dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
+ }
dev_set_promiscuity(port->dev, -1);
@@ -192,5 +194,7 @@ void hsr_del_port(struct hsr_port *port)
- dev_put(port->dev);
+ if (port != master)
+ dev_put(port->dev);