netdev - [PATCH AUTOSEL 6.13 34/35] selftests/net/ipsec: Fix Null pointer dereference in rtattr

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Message-Id: <20250126150029.953021-34-sashal@kernel.org>
Date: Sun, 26 Jan 2025 10:00:28 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Liu Ye <liuye@...inos.cn>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	steffen.klassert@...unet.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	shuah@...nel.org,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 6.13 34/35] selftests/net/ipsec: Fix Null pointer dereference in rtattr_pack()

From: Liu Ye <liuye@...inos.cn>

[ Upstream commit 3a0b7fa095212b51ed63892540c4f249991a2d74 ]

Address Null pointer dereference / undefined behavior in rtattr_pack
(note that size is 0 in the bad case).

Flagged by cppcheck as:
    tools/testing/selftests/net/ipsec.c:230:25: warning: Possible null pointer
    dereference: payload [nullPointer]
    memcpy(RTA_DATA(attr), payload, size);
                           ^
    tools/testing/selftests/net/ipsec.c:1618:54: note: Calling function 'rtattr_pack',
    4th argument 'NULL' value is 0
    if (rtattr_pack(&req.nh, sizeof(req), XFRMA_IF_ID, NULL, 0)) {
                                                       ^
    tools/testing/selftests/net/ipsec.c:230:25: note: Null pointer dereference
    memcpy(RTA_DATA(attr), payload, size);
                           ^
Signed-off-by: Liu Ye <liuye@...inos.cn>

Link: https://patch.msgid.link/20250116013037.29470-1-liuye@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/net/ipsec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/ipsec.c b/tools/testing/selftests/net/ipsec.c
index be4a30a0d02ae..9b44a091802cb 100644
--- a/tools/testing/selftests/net/ipsec.c
+++ b/tools/testing/selftests/net/ipsec.c
@@ -227,7 +227,8 @@ static int rtattr_pack(struct nlmsghdr *nh, size_t req_sz,
 
 	attr->rta_len = RTA_LENGTH(size);
 	attr->rta_type = rta_type;
-	memcpy(RTA_DATA(attr), payload, size);
+	if (payload)
+		memcpy(RTA_DATA(attr), payload, size);
 
 	return 0;
 }
-- 
2.39.5