[PATCH net] ipv4/fib: don't warn when primary address is missing if in_dev is dead

[Paolo Abeni]

After commit fbd40ea0180a ("ipv4: Don't do expensive useless work
during inetdev destroy.") when deleting an interface,
fib_del_ifaddr() can be executed without any primary address
present on the dead interface.

The above is safe, but triggers some "bug: prim == NULL" warnings.

This commit avoids warning if the in_dev is dead

Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
 net/ipv4/fib_frontend.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 8a9246d..63566ec 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -904,7 +904,11 @@ void fib_del_ifaddr(struct in_ifaddr *ifa, struct 
in_ifaddr *iprim)
        if (ifa->ifa_flags & IFA_F_SECONDARY) {
                prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
                if (!prim) {
-                       pr_warn("%s: bug: prim == NULL\n", __func__);
+                       /* if the device has been deleted, we don't perform
+                        * address promotion
+                        */
+                       if (!in_dev->dead)
+                               pr_warn("%s: bug: prim == NULL\n", __func__);
                        return;
                }
                if (iprim && iprim != prim) {
-- 
1.8.3.1