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authorSven Eckelmann <sven@narfation.org>2022-02-28 00:01:24 +0100
committerSimon Wunderlich <sw@simonwunderlich.de>2022-03-02 09:01:28 +0100
commit6116ba09423f7d140f0460be6a1644dceaad00da (patch)
tree7de3725a2b54c2051e9ab036a9f35921910d95a4 /net/batman-adv
parent690bb6fb64f5dc7437317153902573ecad67593d (diff)
batman-adv: Request iflink once in batadv_get_real_netdevice
There is no need to call dev_get_iflink multiple times for the same net_device in batadv_get_real_netdevice. And since some of the ndo_get_iflink callbacks are dynamic (for example via RCUs like in vxcan_get_iflink), it could easily happen that the returned values are not stable. The pre-checks before __dev_get_by_index are then of course bogus. Fixes: 5ed4a460a1d3 ("batman-adv: additional checks for virtual interfaces on top of WiFi") Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/hard-interface.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 35aa1122043b..e2760cfce190 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -215,14 +215,16 @@ static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
struct net_device *real_netdev = NULL;
struct net *real_net;
struct net *net;
- int ifindex;
+ int iflink;
ASSERT_RTNL();
if (!netdev)
return NULL;
- if (netdev->ifindex == dev_get_iflink(netdev)) {
+ iflink = dev_get_iflink(netdev);
+
+ if (netdev->ifindex == iflink) {
dev_hold(netdev);
return netdev;
}
@@ -232,9 +234,8 @@ static struct net_device *batadv_get_real_netdevice(struct net_device *netdev)
goto out;
net = dev_net(hard_iface->soft_iface);
- ifindex = dev_get_iflink(netdev);
real_net = batadv_getlink_net(netdev, net);
- real_netdev = dev_get_by_index(real_net, ifindex);
+ real_netdev = dev_get_by_index(real_net, iflink);
out:
batadv_hardif_put(hard_iface);