From 8854258a5e9eda15de26fa36f6a854da94ffed86 Mon Sep 17 00:00:00 2001 From: "Tobin C. Harding" Date: Fri, 17 May 2019 16:15:29 +0800 Subject: [PATCH] bridge: Fix error path for kobject_init_and_add() [ Upstream commit bdfad5aec1392b93495b77b864d58d7f101dc1c1 ] Currently error return from kobject_init_and_add() is not followed by a call to kobject_put(). This means there is a memory leak. We currently set p to NULL so that kfree() may be called on it as a noop, the code is arguably clearer if we move the kfree() up closer to where it is called (instead of after goto jump). Remove a goto label 'err1' and jump to call to kobject_put() in error return from kobject_init_and_add() fixing the memory leak. Re-name goto label 'put_back' to 'err1' now that we don't use err1, following current nomenclature (err1, err2 ...). Move call to kfree out of the error code at bottom of function up to closer to where memory was allocated. Add comment to clarify call to kfree(). Signed-off-by: Tobin C. Harding Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman Signed-off-by: Yang Yingliang --- net/bridge/br_if.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c index 0363f1bdc401..ed2b6002ae53 100644 --- a/net/bridge/br_if.c +++ b/net/bridge/br_if.c @@ -603,13 +603,15 @@ int br_add_if(struct net_bridge *br, struct net_device *dev, call_netdevice_notifiers(NETDEV_JOIN, dev); err = dev_set_allmulti(dev, 1); - if (err) - goto put_back; + if (err) { + kfree(p); /* kobject not yet init'd, manually free */ + goto err1; + } err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), SYSFS_BRIDGE_PORT_ATTR); if (err) - goto err1; + goto err2; err = br_sysfs_addif(p); if (err) @@ -692,12 +694,9 @@ int br_add_if(struct net_bridge *br, struct net_device *dev, sysfs_remove_link(br->ifobj, p->dev->name); err2: kobject_put(&p->kobj); - p = NULL; /* kobject_put frees */ -err1: dev_set_allmulti(dev, -1); -put_back: +err1: dev_put(dev); - kfree(p); return err; } -- GitLab