selftests: rtnetlink: add addresses with fixed life time

This exercises kernel code path that deal with addresses that have
a limited lifetime.

Without previous fix, this triggers following crash on net-next:
 BUG: KASAN: null-ptr-deref in check_lifetime+0x403/0x670
 Read of size 8 at addr 0000000000000010 by task kworker [..]

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
index b25c9fe..ed606a2 100755 (executable)
--- a/tools/testing/selftests/net/rtnetlink.sh
+++ b/tools/testing/selftests/net/rtnetlink.sh
@@ -249,6 +249,26 @@ kci_test_route_get()
        echo "PASS: route get"
 }
 
+kci_test_addrlft()
+{
+       for i in $(seq 10 100) ;do
+               lft=$(((RANDOM%3) + 1))
+               ip addr add 10.23.11.$i/32 dev "$devdummy" preferred_lft $lft valid_lft $((lft+1))
+               check_err $?
+       done
+
+       sleep 5
+
+       ip addr show dev "$devdummy" | grep "10.23.11."
+       if [ $? -eq 0 ]; then
+               echo "FAIL: preferred_lft addresses remaining"
+               check_err 1
+               return
+       fi
+
+       echo "PASS: preferred_lft addresses have expired"
+}
+
 kci_test_addrlabel()
 {
        ret=0
@@ -1140,6 +1160,7 @@ kci_test_rtnl()
 
        kci_test_polrouting
        kci_test_route_get
+       kci_test_addrlft
        kci_test_tc
        kci_test_gre
        kci_test_gretap