[net-next,v2,02/10] neighbour: Use nlmsg_payload in neightbl_valid_dump_info

Commit Message

Breno Leitao April 14, 2025, 1:24 p.m. UTC

Update neightbl_valid_dump_info function to utilize the new
nlmsg_payload() helper function.

This change improves code clarity and safety by ensuring that the
Netlink message payload is properly validated before accessing its data.

Signed-off-by: Breno Leitao <[e-mail]>
Reviewed-by: Kuniyuki Iwashima <[e-mail]>
---
 net/core/neighbour.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index a07249b59ae1e..b6bc4836c6e45 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2430,12 +2430,12 @@  static int neightbl_valid_dump_info(const struct nlmsghdr *nlh,
 {
 	struct ndtmsg *ndtm;
 
-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) {
+	ndtm = nlmsg_payload(nlh, sizeof(*ndtm));
+	if (!ndtm) {
 		NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request");
 		return -EINVAL;
 	}
 
-	ndtm = nlmsg_data(nlh);
 	if (ndtm->ndtm_pad1  || ndtm->ndtm_pad2) {
 		NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request");
 		return -EINVAL;