[PATCH v2 6/8] net: ieee802154: do not leave a dangling sk pointer in ieee802154_create()

[Ignat Korchagin]

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 <ig...@cloudflare.com>
---
 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 990a83455dcf..18d267921bb5 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -1043,19 +1043,21 @@ 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 = {
-- 
2.39.5