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Message-ID: <00000000000054dd20060ac84858@google.com>
Date: Wed, 22 Nov 2023 18:06:23 -0800
From: syzbot <syzbot+60bfed6b415fbd1fbb87@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in __lock_sock
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Subject: [bluetooth?] KASAN: slab-use-after-free Read in __lock_sock
Author: eadavis@...com
please test uaf in __lock_sock
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 8de1e7afcc1c
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index c736186aba26..82e50c215386 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -270,6 +270,7 @@ static int sco_connect(struct sock *sk)
goto unlock;
}
+ hci_conn_get(hcon);
conn = sco_conn_add(hcon);
if (!conn) {
hci_conn_drop(hcon);
@@ -438,12 +439,13 @@ static void __sco_sock_close(struct sock *sk)
case BT_CONNECTED:
case BT_CONFIG:
if (sco_pi(sk)->conn->hcon) {
+ struct hci_conn *hcon = sco_pi(sk)->conn->hcon;
sk->sk_state = BT_DISCONN;
sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
sco_conn_lock(sco_pi(sk)->conn);
- hci_conn_drop(sco_pi(sk)->conn->hcon);
sco_pi(sk)->conn->hcon = NULL;
sco_conn_unlock(sco_pi(sk)->conn);
+ hci_conn_put(hcon);
} else
sco_chan_del(sk, ECONNRESET);
break;
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