Leverage the new nlmsg_payload() helper to avoid checking for message
size and then reading the nlmsg data.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 net/core/rtnetlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 39a5b72e861f6..31addd26b5570 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4886,12 +4886,12 @@ static int valid_fdb_dump_strict(const struct nlmsghdr *nlh,
 	struct ndmsg *ndm;
 	int err, i;
 
-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
+	ndm = nlmsg_payload(nlh, sizeof(*ndm));
+	if (!ndm) {
 		NL_SET_ERR_MSG(extack, "Invalid header for fdb dump request");
 		return -EINVAL;
 	}
 
-	ndm = nlmsg_data(nlh);
 	if (ndm->ndm_pad1  || ndm->ndm_pad2  || ndm->ndm_state ||
 	    ndm->ndm_flags || ndm->ndm_type) {
 		NL_SET_ERR_MSG(extack, "Invalid values in header for fdb dump request");

-- 
2.47.1

From: Breno Leitao <leitao@debian.org>
Date: Fri, 11 Apr 2025 10:00:51 -0700
> Leverage the new nlmsg_payload() helper to avoid checking for message
> size and then reading the nlmsg data.
> 
> Signed-off-by: Breno Leitao <leitao@debian.org>

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>