5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ignat Korchagin ignat@cloudflare.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@cloudflare.com Reviewed-by: Miquel Raynal miquel.raynal@bootlin.com Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Eric Dumazet edumazet@google.com Link: https://patch.msgid.link/20241014153808.51894-6-ignat@cloudflare.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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 ce5f25c89dfaf..b5f8aaa428844 100644 --- a/net/ieee802154/socket.c +++ b/net/ieee802154/socket.c @@ -1055,19 +1055,21 @@ 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 = {