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Bluetooth: SCO: Fix UAF on sco_sock_timeout

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conn->sk maybe have been unlinked/freed while waiting for sco_conn_lock
so this checks if the conn->sk is still valid by checking if it part of
sco_sk_list.

Reported-by: syzbot+4c0d0c4cde787116d465@syzkaller.appspotmail.com
Tested-by: syzbot+4c0d0c4cde787116d465@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=4c0d0c4cde787116d465
Fixes: ba316be1b6 ("Bluetooth: schedule SCO timeouts with delayed_work")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz
2024-10-22 12:31:08 -04:00
parent 989fa5171f
commit 1bf4470a39
3 changed files with 35 additions and 6 deletions
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include/net/bluetooth/bluetooth.h
+1
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@@ -403,6 +403,7 @@ int bt_sock_register(int proto, const struct net_proto_family *ops);
void bt_sock_unregister(int proto);
void bt_sock_link(struct bt_sock_list *l, struct sock *s);
void bt_sock_unlink(struct bt_sock_list *l, struct sock *s);
bool bt_sock_linked(struct bt_sock_list *l, struct sock *s);
struct sock *bt_sock_alloc(struct net *net, struct socket *sock,
struct proto *prot, int proto, gfp_t prio, int kern);
int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,