linux-kernel - [PATCH 4.7 017/184] net sched: fix encoding to use real length

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Message-Id: <20160922174049.385038815@linuxfoundation.org>
Date:   Thu, 22 Sep 2016 19:39:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.7 017/184] net sched: fix encoding to use real length

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jamal Hadi Salim <jhs@...atatu.com>


[ Upstream commit 28a10c426e81afc88514bca8e73affccf850fdf6 ]

Encoding of the metadata was using the padded length as opposed to
the real length of the data which is a bug per specification.
This has not been an issue todate because all metadatum specified
so far has been 32 bit where aligned and data length are the same width.
This also includes a bug fix for validating the length of a u16 field.
But since there is no metadata of size u16 yes we are fine to include it
here.

While at it get rid of magic numbers.

Fixes: ef6980b6becb ("net sched: introduce IFE action")
Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/act_ife.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/net/sched/act_ife.c
+++ b/net/sched/act_ife.c
@@ -52,7 +52,7 @@ int ife_tlv_meta_encode(void *skbdata, u
 	u32 *tlv = (u32 *)(skbdata);
 	u16 totlen = nla_total_size(dlen);	/*alignment + hdr */
 	char *dptr = (char *)tlv + NLA_HDRLEN;
-	u32 htlv = attrtype << 16 | totlen;
+	u32 htlv = attrtype << 16 | dlen;
 
 	*tlv = htonl(htlv);
 	memset(dptr, 0, totlen - NLA_HDRLEN);
@@ -134,7 +134,7 @@ EXPORT_SYMBOL_GPL(ife_release_meta_gen);
 
 int ife_validate_meta_u32(void *val, int len)
 {
-	if (len == 4)
+	if (len == sizeof(u32))
 		return 0;
 
 	return -EINVAL;
@@ -143,8 +143,8 @@ EXPORT_SYMBOL_GPL(ife_validate_meta_u32)
 
 int ife_validate_meta_u16(void *val, int len)
 {
-	/* length will include padding */
-	if (len == NLA_ALIGN(2))
+	/* length will not include padding */
+	if (len == sizeof(u16))
 		return 0;
 
 	return -EINVAL;
@@ -652,12 +652,14 @@ static int tcf_ife_decode(struct sk_buff
 		u8 *tlvdata = (u8 *)tlv;
 		u16 mtype = tlv->type;
 		u16 mlen = tlv->len;
+		u16 alen;
 
 		mtype = ntohs(mtype);
 		mlen = ntohs(mlen);
+		alen = NLA_ALIGN(mlen);
 
-		if (find_decode_metaid(skb, ife, mtype, (mlen - 4),
-				       (void *)(tlvdata + 4))) {
+		if (find_decode_metaid(skb, ife, mtype, (mlen - NLA_HDRLEN),
+				       (void *)(tlvdata + NLA_HDRLEN))) {
 			/* abuse overlimits to count when we receive metadata
 			 * but dont have an ops for it
 			 */
@@ -666,8 +668,8 @@ static int tcf_ife_decode(struct sk_buff
 			ife->tcf_qstats.overlimits++;
 		}
 
-		tlvdata += mlen;
-		ifehdrln -= mlen;
+		tlvdata += alen;
+		ifehdrln -= alen;
 		tlv = (struct meta_tlvhdr *)tlvdata;
 	}