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rtnetlink: Use nlmsg_payload in valid_fdb_dump_strict

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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>
Link: https://patch.msgid.link/20250414-nlmsg-v2-4-3d90cb42c6af@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Breno Leitao 2025-04-14 06:24:10 -07:00 committed by Jakub Kicinski
parent 2d1f827f06
commit 77d0229036
1 changed files with 2 additions and 2 deletions
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4
net/core/rtnetlink.c
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@ -4887,12 +4887,12 @@ 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");