From: Ignat Korchagin ignat@cloudflare.com
[ Upstream commit 811a7ca7320c062e15d0f5b171fe6ad8592d1434 ]
On error can_create() frees the allocated sk object, but sock_init_data() has already attached it to the provided sock object. This will leave a dangling sk pointer in the sock object and may cause use-after-free later.
Signed-off-by: Ignat Korchagin ignat@cloudflare.com Reviewed-by: Vincent Mailhol mailhol.vincent@wanadoo.fr Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Marc Kleine-Budde mkl@pengutronix.de Link: https://patch.msgid.link/20241014153808.51894-5-ignat@cloudflare.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/can/af_can.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/can/af_can.c b/net/can/af_can.c index 20d2dcb7c97ae..4e728b3da40b3 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -171,6 +171,7 @@ static int can_create(struct net *net, struct socket *sock, int protocol, /* release sk on errors */ sock_orphan(sk); sock_put(sk); + sock->sk = NULL; }
errout: