netdev - [PATCH net] net: ipv6: rpl_iptunnel: Fix memory leak in rpl

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Message-Id: <20240911174557.11536-1-justin.iurman@uliege.be>
Date: Wed, 11 Sep 2024 19:45:57 +0200
From: Justin Iurman <justin.iurman@...ege.be>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	dsahern@...nel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-kernel@...r.kernel.org,
	aahringo@...hat.com,
	alex.aring@...il.com,
	justin.iurman@...ege.be
Subject: [PATCH net] net: ipv6: rpl_iptunnel: Fix memory leak in rpl_input

Free the skb before returning from rpl_input when skb_cow_head() fails.
Use a "drop" label and goto instructions.

Fixes: a7a29f9c361f ("net: ipv6: add rpl sr tunnel")
Signed-off-by: Justin Iurman <justin.iurman@...ege.be>
---
 net/ipv6/rpl_iptunnel.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/rpl_iptunnel.c b/net/ipv6/rpl_iptunnel.c
index 2c83b7586422..db3c19a42e1c 100644
--- a/net/ipv6/rpl_iptunnel.c
+++ b/net/ipv6/rpl_iptunnel.c
@@ -263,10 +263,8 @@ static int rpl_input(struct sk_buff *skb)
 	rlwt = rpl_lwt_lwtunnel(orig_dst->lwtstate);
 
 	err = rpl_do_srh(skb, rlwt);
-	if (unlikely(err)) {
-		kfree_skb(skb);
-		return err;
-	}
+	if (unlikely(err))
+		goto drop;
 
 	local_bh_disable();
 	dst = dst_cache_get(&rlwt->cache);
@@ -286,9 +284,13 @@ static int rpl_input(struct sk_buff *skb)
 
 	err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
 	if (unlikely(err))
-		return err;
+		goto drop;
 
 	return dst_input(skb);
+
+drop:
+	kfree_skb(skb);
+	return err;
 }
 
 static int nla_put_rpl_srh(struct sk_buff *skb, int attrtype,
-- 
2.34.1