Re: [PATCH] net: vrf: Reset rt6i_idev in local dst after put

[David Miller]

From: David Ahern 
Date: Fri, 17 Mar 2017 16:07:11 -0700

> The VRF driver takes a reference to the inet6_dev on the VRF device for
> its rt6_local dst when handling local traffic through the VRF device as
> a loopback. When the device is deleted the driver does a put on the idev
> but does not reset rt6i_idev in the rt6_info struct. When the dst is
> destroyed, dst_destroy calls ip6_dst_destroy which does a second put for
> what is essentially the same reference causing it to be prematurely freed.
> Reset rt6i_idev after the put in the vrf driver.
> 
> Fixes: b4869aa2f881e ("net: vrf: ipv6 support for local traffic to
>local addresses")
> Signed-off-by: David Ahern 

Applied and queued up for -stable.

[PATCH] net: vrf: Reset rt6i_idev in local dst after put

[David Ahern]

The VRF driver takes a reference to the inet6_dev on the VRF device for
its rt6_local dst when handling local traffic through the VRF device as
a loopback. When the device is deleted the driver does a put on the idev
but does not reset rt6i_idev in the rt6_info struct. When the dst is
destroyed, dst_destroy calls ip6_dst_destroy which does a second put for
what is essentially the same reference causing it to be prematurely freed.
Reset rt6i_idev after the put in the vrf driver.

Fixes: b4869aa2f881e ("net: vrf: ipv6 support for local traffic to
   local addresses")
Signed-off-by: David Ahern 
---
 drivers/net/vrf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 7f28021d9d93..761ea041b018 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -462,8 +462,10 @@ static void vrf_rt6_release(struct net_device *dev, struct 
net_vrf *vrf)
}
 
if (rt6_local) {
-   if (rt6_local->rt6i_idev)
+   if (rt6_local->rt6i_idev) {
in6_dev_put(rt6_local->rt6i_idev);
+   rt6_local->rt6i_idev = NULL;
+   }
 
dst = _local->dst;
dev_put(dst->dev);
-- 
2.1.4