linux-kernel - [PATCH] selftests/net/ipsec: Fix Null pointer dereference in rtattr

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Message-Id: <20250114074329.102691-1-liuye@kylinos.cn>
Date: Tue, 14 Jan 2025 15:43:29 +0800
From: liuye <liuye@...inos.cn>
To: steffen.klassert@...unet.com,
	herbert@...dor.apana.org.au,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	shuah@...nel.org
Cc: horms@...nel.org,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	liuye <liuye@...inos.cn>
Subject: [PATCH] selftests/net/ipsec: Fix Null pointer dereference in rtattr_pack()

    Fix the following warning.

    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: liuye <liuye@...inos.cn>
---
 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 be4a30a0d02a..725310ac26a9 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 != NULL)
+		memcpy(RTA_DATA(attr), payload, size);
 
 	return 0;
 }
-- 
2.25.1