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Message-Id: <1493438207-27538-1-git-send-email-gfree.wind@foxmail.com> Date: Sat, 29 Apr 2017 11:56:47 +0800 From: gfree.wind@...mail.com To: davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org Cc: Gao Feng <gfree.wind@...mail.com> Subject: [PATCH net v3] net: ip_tunnel: Fix one possbile memleak when fail to register_netdevice From: Gao Feng <gfree.wind@...mail.com> The ip_tunnel allocates some resources in its ndo_init func, and free some of them in its destructor func. Then there is one memleak that some errors happen after register_netdevice invokes the ndo_init callback. Because only the ndo_uninit callback is invoked in the error handler of register_netdevice, but destructor not. Now create one new func ip_tunnel_destructor_free to free the mem in the destructor, and ndo_uninit func also invokes it when fail to register the ip_tunnel device. It's not only free all resources, but also follow the original desgin that the resources are freed in the destructor normally after register the device successfully. Signed-off-by: Gao Feng <gfree.wind@...mail.com> --- v3: Split one patch to multiple commits, per David Ahern v2: Move the free in ndo_uninit when fail to register, per Herbert Xu v1: initial version net/ipv4/ip_tunnel.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index 823abae..96a3005 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -954,13 +954,18 @@ int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) } EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); -static void ip_tunnel_dev_free(struct net_device *dev) +static void ip_tunnel_destructor_free(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); gro_cells_destroy(&tunnel->gro_cells); dst_cache_destroy(&tunnel->dst_cache); free_percpu(dev->tstats); +} + +static void ip_tunnel_dev_free(struct net_device *dev) +{ + ip_tunnel_destructor_free(dev); free_netdev(dev); } @@ -1192,6 +1197,10 @@ void ip_tunnel_uninit(struct net_device *dev) ip_tunnel_del(itn, netdev_priv(dev)); dst_cache_reset(&tunnel->dst_cache); + + /* dev is not registered, perform the free instead of destructor */ + if (dev->reg_state == NETREG_UNINITIALIZED) + ip_tunnel_destructor_free(dev); } EXPORT_SYMBOL_GPL(ip_tunnel_uninit); -- 2.7.4
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