linux-kernel - [PATCH AUTOSEL 4.19 08/21] net: ieee802154: do not leave a dangling sk pointer in ieee802154

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Message-ID: <20241124135709.3351371-8-sashal@kernel.org>
Date: Sun, 24 Nov 2024 08:56:41 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ignat Korchagin <ignat@...udflare.com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	alex.aring@...il.com,
	stefan@...enfreihafen.org,
	davem@...emloft.net,
	pabeni@...hat.com,
	linux-wpan@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 08/21] net: ieee802154: do not leave a dangling sk pointer in ieee802154_create()

From: Ignat Korchagin <ignat@...udflare.com>

[ Upstream commit b4fcd63f6ef79c73cafae8cf4a114def5fc3d80d ]

sock_init_data() attaches the allocated sk object to the provided sock
object. If ieee802154_create() fails later, the allocated sk object is
freed, but the dangling pointer remains in the provided sock object, which
may allow use-after-free.

Clear the sk pointer in the sock object on error.

Signed-off-by: Ignat Korchagin <ignat@...udflare.com>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Link: https://patch.msgid.link/20241014153808.51894-6-ignat@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ieee802154/socket.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index ee1536de5fca4..5dba3341e3f1f 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -1065,19 +1065,21 @@ static int ieee802154_create(struct net *net, struct socket *sock,
 
 	if (sk->sk_prot->hash) {
 		rc = sk->sk_prot->hash(sk);
-		if (rc) {
-			sk_common_release(sk);
-			goto out;
-		}
+		if (rc)
+			goto out_sk_release;
 	}
 
 	if (sk->sk_prot->init) {
 		rc = sk->sk_prot->init(sk);
 		if (rc)
-			sk_common_release(sk);
+			goto out_sk_release;
 	}
 out:
 	return rc;
+out_sk_release:
+	sk_common_release(sk);
+	sock->sk = NULL;
+	goto out;
 }
 
 static const struct net_proto_family ieee802154_family_ops = {
-- 
2.43.0