[PATCH 4.4 44/48] net: rtnl_configure_link: fix dev flags changes arg to __dev_notify_flags

From: Greg Kroah-Hartman
Date: Mon Jun 01 2020 - 14:59:53 EST


From: Roopa Prabhu <roopa@xxxxxxxxxxxxxxxxxxx>

commit 56a49d7048703f5ffdb84d3a0ee034108fba6850 upstream.

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 <liam.mcbirnie@xxxxxxxxxx>
Signed-off-by: Roopa Prabhu <roopa@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2105,7 +2105,7 @@ int rtnl_configure_link(struct net_devic
}

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);