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authorEric Dumazet <edumazet@google.com>2022-01-12 15:53:00 +0300
committerDavid S. Miller <davem@davemloft.net>2022-01-12 17:44:18 +0300
commitfcfb894d5952786db3b2b2b9cd3a95cdcedb6ff0 (patch)
tree9a19318c08a4c63c3cf8d7183397293ea6c37486 /net
parent0bbed88af55ed804d19aeb23b32b72b29e1435ee (diff)
downloadlinux-fcfb894d5952786db3b2b2b9cd3a95cdcedb6ff0.tar.xz
net: bridge: fix net device refcount tracking issue in error path
I left one dev_put() in br_add_if() error path and sure enough syzbot found its way. As the tracker is allocated in new_nbp(), we must make sure to properly free it. We have to call dev_put_track(dev, &p->dev_tracker) before @p object is freed, of course. This is not an issue because br_add_if() owns a reference on @dev. Fixes: b2dcdc7f731d ("net: bridge: add net device refcount tracker") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_if.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index a52ad81596b7..55f47cadb114 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -615,6 +615,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
err = dev_set_allmulti(dev, 1);
if (err) {
br_multicast_del_port(p);
+ dev_put_track(dev, &p->dev_tracker);
kfree(p); /* kobject not yet init'd, manually free */
goto err1;
}
@@ -724,10 +725,10 @@ err3:
sysfs_remove_link(br->ifobj, p->dev->name);
err2:
br_multicast_del_port(p);
+ dev_put_track(dev, &p->dev_tracker);
kobject_put(&p->kobj);
dev_set_allmulti(dev, -1);
err1:
- dev_put(dev);
return err;
}