Re: [PATCH net] net: rtnl_configure_link: fix dev flags changes arg to __dev_notify_flags

[David Miller]

From: Roopa Prabhu 
Date: Wed, 12 Sep 2018 13:21:48 -0700

> From: Roopa Prabhu 
> 
> This fix addresses https://bugzilla.kernel.org/show_bug.cgi?id=201071
> 
> Commit 5025f7f7d506 wrongly relied on __dev_change_flags to notify users of
> dev flag changes in the case when dev->rtnl_link_state = 
> RTNL_LINK_INITIALIZED.
> Fix it by indicating flag changes explicitly to __dev_notify_flags.
> 
> Fixes: 5025f7f7d506 ("rtnetlink: add rtnl_link_state check in 
> rtnl_configure_link")
> Reported-By: Liam mcbirnie 
> Signed-off-by: Roopa Prabhu 

Applied.

> ---
> Dave, if 5025f7f7d506 made it to stable, request you to pls queue this one up 
> too. Thanks.

I will, thanks.

[PATCH net] net: rtnl_configure_link: fix dev flags changes arg to __dev_notify_flags

[Roopa Prabhu]

From: Roopa Prabhu 

This fix addresses https://bugzilla.kernel.org/show_bug.cgi?id=201071

Commit 5025f7f7d506 wrongly relied on __dev_change_flags to notify users of
dev flag changes in the case when dev->rtnl_link_state = RTNL_LINK_INITIALIZED.
Fix it by indicating flag changes explicitly to __dev_notify_flags.

Fixes: 5025f7f7d506 ("rtnetlink: add rtnl_link_state check in 
rtnl_configure_link")
Reported-By: Liam mcbirnie 
Signed-off-by: Roopa Prabhu 
---
Dave, if 5025f7f7d506 made it to stable, request you to pls queue this one up 
too. Thanks.

 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 60c9288..63ce2283 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2810,7 +2810,7 @@ int rtnl_configure_link(struct net_device *dev, const 
struct ifinfomsg *ifm)
}
 
if (dev->rtnl_link_state == RTNL_LINK_INITIALIZED) {
-   __dev_notify_flags(dev, old_flags, 0U);
+   __dev_notify_flags(dev, old_flags, (old_flags ^ dev->flags));
} else {
dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
__dev_notify_flags(dev, old_flags, ~0U);
-- 
2.1.4