From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3EDB3383C86; Fri, 7 Aug 2026 14:56:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786114593; cv=none; b=ZIhvchhmkBrovQgO/xHMyepibULOR2RjVOs3nLOXmenzjLgYnuMvIqJbAWKYTnBHgUgPHsja2ldGQDBxqo3v5FhzT/8JZjWOOe+aMXKIyWmKRz+0WyOb+2kcH01pCu1yybwEXtO037029mmSEgJxPZZzLbp5fefi6k0D2Vj0Axg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786114593; c=relaxed/simple; bh=jh97WJ0fksw0Thx/edqhogGZ90wdVAJOk4V0onsX1z4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YjpqDkuAcVqTrowjTVjbM4E1Yj+hviSQ9qAtRT9vye+WoPqO2cUbxdTnpg8j5Gvf33iNVWZ7RDtKu6gLsgqEk6nd56GCBHDNzoYxMGt2eQaq9XE7+qIM77Ld7zCQvII5ZxDkyUePYs89WnI9FmGC77hN4m8NoXaT0AbihC1PQb0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VeAiMtvn; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VeAiMtvn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8E0F1F00A3D; Fri, 7 Aug 2026 14:56:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786114587; bh=MoSmHwbypCltRx0ZRoHw28dLIiIcSUlUP8/H22TSKqA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VeAiMtvnWHC5P4domaVXYfRt9FtvK1z4k7HQ/wPQH/Ucq/B2PGn5/wezJCyqm/a/4 BqEEBU/08ka3dEkr5CgM0eTurudLpXBZWB7JP6dLJUDzoNaLm73ShWkSyamgUc3Hx0 yKZ4yY/WgGr7CBBIOeLt44oSQDUKJRUhd++J65Sk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pauli Virtanen , Luiz Augusto von Dentz Subject: [PATCH 6.12 272/337] Bluetooth: ISO: fix CONNECTED -> CLOSED transition on shutdown/release Date: Fri, 7 Aug 2026 16:37:55 +0200 Message-ID: <20260807143424.436513494@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260807143418.516897842@linuxfoundation.org> References: <20260807143418.516897842@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pauli Virtanen commit 0786469ee242952008628ed0e2d386098e2065ab upstream. Commit d57e506f6a1e ("Bluetooth: ISO: clear iso_data always when detaching conn from hcon") merged a version of the UAF fix that breaks releasing connected ISO sockets. Since hci_conn::iso_data is set to NULL, iso_chan_del() won't be called when the hci_conn disconnects, and the ISO socket does not emit POLLHUP correctly. Fix by retaining full hci_conn <-> iso_conn association while in BT_DISCONNECT state, so that local disconnect via shutdown() follows similar ISO socket code path as remote disconnect. Use a separate flag to track whether hci_conn_drop() is needed, instead of setting iso_conn::hcon = NULL In iso_sock_ready(), disallow disconnecting socket going BT_CONNECTED, in case hcon connects while its drop is pending. Fixes: d57e506f6a1e ("Bluetooth: ISO: clear iso_data always when detaching conn from hcon") Fixes: fbdc4bc47268 ("Bluetooth: ISO: Use defer setup to separate PA sync and BIG sync") Signed-off-by: Pauli Virtanen Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/iso.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) --- a/net/bluetooth/iso.c +++ b/net/bluetooth/iso.c @@ -23,8 +23,14 @@ static struct bt_sock_list iso_sk_list = }; /* ---- ISO connections ---- */ +enum { + ISO_CONN_DROPPED, + __ISO_CONN_NUM_FLAGS +}; + struct iso_conn { struct hci_conn *hcon; + DECLARE_BITMAP(flags, __ISO_CONN_NUM_FLAGS); /* @lock: spinlock protecting changes to iso_conn fields */ spinlock_t lock; @@ -105,7 +111,8 @@ static void iso_conn_free(struct kref *r if (conn->hcon) { conn->hcon->iso_data = NULL; - hci_conn_drop(conn->hcon); + if (!test_and_set_bit(ISO_CONN_DROPPED, conn->flags)) + hci_conn_drop(conn->hcon); } kfree_skb(conn->rx_skb); @@ -299,6 +306,7 @@ static int __iso_chan_add(struct iso_con iso_pi(sk)->conn = conn; conn->sk = sk; + clear_bit(ISO_CONN_DROPPED, conn->flags); if (parent) bt_accept_enqueue(parent, sk, true); @@ -813,11 +821,8 @@ static void iso_sock_disconn(struct sock } sk->sk_state = BT_DISCONN; - iso_conn_lock(iso_pi(sk)->conn); - hci_conn_drop(iso_pi(sk)->conn->hcon); - iso_pi(sk)->conn->hcon->iso_data = NULL; - iso_pi(sk)->conn->hcon = NULL; - iso_conn_unlock(iso_pi(sk)->conn); + if (!test_and_set_bit(ISO_CONN_DROPPED, iso_pi(sk)->conn->flags)) + hci_conn_drop(iso_pi(sk)->conn->hcon); } static void __iso_sock_close(struct sock *sk) @@ -1894,9 +1899,18 @@ static void iso_sock_ready(struct sock * return; lock_sock(sk); + + switch (sk->sk_state) { + case BT_DISCONN: + case BT_CLOSED: + release_sock(sk); + return; + } + iso_sock_clear_timer(sk); sk->sk_state = BT_CONNECTED; sk->sk_state_change(sk); + release_sock(sk); }