diff mbox series

[net-next,7/8] ipv4: Use nlmsg_payload in ipmr file

Message ID 20250415-nlmsg_v2-v1-7-a1c75d493fd7@debian.org (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series Adopting nlmsg_payload() in IPv4/IPv6 | expand

Commit Message

Breno Leitao April 15, 2025, 7:28 p.m. UTC 
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/ipv4/ipmr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Comments

Kuniyuki Iwashima April 16, 2025, 1:06 a.m. UTC | #1 
From: Breno Leitao <leitao@debian.org>
Date: Tue, 15 Apr 2025 12:28:58 -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>
diff mbox series

Patch

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index a8b04d4abcaae..3b5677d8467ef 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2511,7 +2511,8 @@  static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
 	struct rtmsg *rtm;
 	int i, err;
 
-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
+	rtm = nlmsg_payload(nlh, sizeof(*rtm));
+	if (!rtm) {
 		NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request");
 		return -EINVAL;
 	}
@@ -2520,7 +2521,6 @@  static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb,
 		return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
 					      rtm_ipv4_policy, extack);
 
-	rtm = nlmsg_data(nlh);
 	if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) ||
 	    (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) ||
 	    rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
@@ -2836,7 +2836,8 @@  static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
 {
 	struct ifinfomsg *ifm;
 
-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
+	ifm = nlmsg_payload(nlh, sizeof(*ifm));
+	if (!ifm) {
 		NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump");
 		return -EINVAL;
 	}
@@ -2846,7 +2847,6 @@  static int ipmr_valid_dumplink(const struct nlmsghdr *nlh,
 		return -EINVAL;
 	}
 
-	ifm = nlmsg_data(nlh);
 	if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
 	    ifm->ifi_change || ifm->ifi_index) {
 		NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request");