linux-kernel - [PATCH 4.19 101/115] selftests: rtnetlink: add addresses with fixed life time

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Date:   Tue,  7 Jan 2020 21:55:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 101/115] selftests: rtnetlink: add addresses with fixed life time

From: Florian Westphal <fw@...len.de>

[ Upstream commit 3cfa148826e3c666da1cc2a43fbe8689e2650636 ]

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@...len.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/net/rtnetlink.sh | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
index e101af52d1d6..ff665de788ef 100755
--- a/tools/testing/selftests/net/rtnetlink.sh
+++ b/tools/testing/selftests/net/rtnetlink.sh
@@ -234,6 +234,26 @@ 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
@@ -965,6 +985,7 @@ kci_test_rtnl()
 
 	kci_test_polrouting
 	kci_test_route_get
+	kci_test_addrlft
 	kci_test_tc
 	kci_test_gre
 	kci_test_gretap
-- 
2.20.1