netdev - [PATCH net-next v2 1/2] net: diag: slightly refactor the inet_diag_bc

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Message-Id: <1472021186-4106-1-git-send-email-lorenzo@google.com>
Date:   Wed, 24 Aug 2016 15:46:25 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
To:     netdev@...r.kernel.org
Cc:     eric.dumazet@...il.com, dsa@...ulusnetworks.com,
        davem@...emloft.net, ek@...gle.com,
        Lorenzo Colitti <lorenzo@...gle.com>
Subject: [PATCH net-next v2 1/2] net: diag: slightly refactor the inet_diag_bc_audit error checks.

This simplifies the code a bit and also allows inet_diag_bc_audit
to send to userspace an error that isn't EINVAL.

Signed-off-by: Lorenzo Colitti <lorenzo@...gle.com>
---
 net/ipv4/inet_diag.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 38c2c47..a89b68c 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -706,10 +706,16 @@ static bool valid_port_comparison(const struct inet_diag_bc_op *op,
 	return true;
 }
 
-static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
+static int inet_diag_bc_audit(const struct nlattr *attr)
 {
-	const void *bc = bytecode;
-	int  len = bytecode_len;
+	const void *bytecode, *bc;
+	int bytecode_len, len;
+
+	if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
+		return -EINVAL;
+
+	bytecode = bc = nla_data(attr);
+	len = bytecode_len = nla_len(attr);
 
 	while (len > 0) {
 		int min_len = sizeof(struct inet_diag_bc_op);
@@ -1020,13 +1026,13 @@ static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
 		if (nlmsg_attrlen(nlh, hdrlen)) {
 			struct nlattr *attr;
+			int err;
 
 			attr = nlmsg_find_attr(nlh, hdrlen,
 					       INET_DIAG_REQ_BYTECODE);
-			if (!attr ||
-			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
-			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
-				return -EINVAL;
+			err = inet_diag_bc_audit(attr);
+			if (err)
+				return err;
 		}
 		{
 			struct netlink_dump_control c = {
@@ -1051,13 +1057,13 @@ static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
 	    h->nlmsg_flags & NLM_F_DUMP) {
 		if (nlmsg_attrlen(h, hdrlen)) {
 			struct nlattr *attr;
+			int err;
 
 			attr = nlmsg_find_attr(h, hdrlen,
 					       INET_DIAG_REQ_BYTECODE);
-			if (!attr ||
-			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
-			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
-				return -EINVAL;
+			err = inet_diag_bc_audit(attr);
+			if (err)
+				return err;
 		}
 		{
 			struct netlink_dump_control c = {
-- 
2.8.0.rc3.226.g39d4020