From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0D1C08462; Thu, 17 Apr 2025 18:16:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744913776; cv=none; b=gscrKkV86NRuB3sPVCXjX1Mck6822OaOLnLaS6TSpGuP+/bN3+H1i0G4TAjAyBbG7qyCS3kf1eMxFzYb7eZU2c6a5941vbtRCRXJ36oZCC08i5fn0iscCONOlYk6xgNpTYTDxtUM1Od8Up9NFzTTI4oV0/ZSFX9y5GwF+WG4iVw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744913776; c=relaxed/simple; bh=kk3nTNH7V1R8yoL1OQI3zzOG5XoQLthQqj9lirPNtY8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z+iHWupSkgr7KSsUN6GsJsL3wzwD7MF9LSPcagaFyPgf8FZo5+QO+zXZDjsYEd/lqBBqJwQD7iQlXbNLQ4E/oEY4FxfMnUfLlPWgXvM6X1yw8hhRRmnAyL0/jGYGd50L+077GE0wDiV/PWo1+3k4UzJY//zdxEMgRRXFz9XfpBk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=T+kNq3bo; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="T+kNq3bo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71E82C4CEE4; Thu, 17 Apr 2025 18:16:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744913775; bh=kk3nTNH7V1R8yoL1OQI3zzOG5XoQLthQqj9lirPNtY8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T+kNq3boxRh+hXRuT+VOqnTy6ylgXEq1wXXKtDyN8wqLHAh2C8FbDcKg0qifVfeLM dAQnp/DgK0Vaa50TxWQE9p9r9ZXtv+OfvfmHaqYAQSiVO0VJFNUj/s4lIBGdZcFxhk Y8MO1mZOg66Jca2nsU7/FA8bR07m3kpSvatnOEjE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Arseniy Krasnov , syzbot+683f8cb11b94b1824c77@syzkaller.appspotmail.com, Luiz Augusto von Dentz Subject: [PATCH 6.14 449/449] Bluetooth: hci_uart: Fix another race during initialization Date: Thu, 17 Apr 2025 19:52:17 +0200 Message-ID: <20250417175136.394331379@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250417175117.964400335@linuxfoundation.org> References: <20250417175117.964400335@linuxfoundation.org> User-Agent: quilt/0.68 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 6.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arseniy Krasnov commit 5df5dafc171b90d0b8d51547a82657cd5a1986c7 upstream. Do not set 'HCI_UART_PROTO_READY' before call 'hci_uart_register_dev()'. Possible race is when someone calls 'hci_tty_uart_close()' after this bit is set, but 'hci_uart_register_dev()' wasn't done. This leads to access to uninitialized fields. To fix it let's set this bit after device was registered (as before patch c411c62cc133) and to fix previous problem let's add one more bit in addition to 'HCI_UART_PROTO_READY' which allows to perform power up without original bit set (pls see commit c411c62cc133). Crash backtrace from syzbot report: RIP: 0010:skb_queue_empty_lockless include/linux/skbuff.h:1887 [inline] RIP: 0010:skb_queue_purge_reason+0x6d/0x140 net/core/skbuff.c:3936 Call Trace: skb_queue_purge include/linux/skbuff.h:3364 [inline] mrvl_close+0x2f/0x90 drivers/bluetooth/hci_mrvl.c:100 hci_uart_tty_close+0xb6/0x120 drivers/bluetooth/hci_ldisc.c:557 tty_ldisc_close drivers/tty/tty_ldisc.c:455 [inline] tty_ldisc_kill+0x66/0xc0 drivers/tty/tty_ldisc.c:613 tty_ldisc_release+0xc9/0x120 drivers/tty/tty_ldisc.c:781 tty_release_struct+0x10/0x80 drivers/tty/tty_io.c:1690 tty_release+0x4ef/0x640 drivers/tty/tty_io.c:1861 __fput+0x86/0x2a0 fs/file_table.c:450 task_work_run+0x82/0xb0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xa3/0x1b0 kernel/entry/common.c:218 do_syscall_64+0x9a/0x190 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Signed-off-by: Arseniy Krasnov Reported-by: syzbot+683f8cb11b94b1824c77@syzkaller.appspotmail.com Tested-by: syzbot+683f8cb11b94b1824c77@syzkaller.appspotmail.com Closes: https://lore.kernel.org/linux-bluetooth/d159c57f-8490-4c26-79da-6ad3612c4a14@salutedevices.com/ Fixes: 366ceff495f9 ("Bluetooth: hci_uart: fix race during initialization") Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Greg Kroah-Hartman --- drivers/bluetooth/hci_ldisc.c | 20 ++++++++++++++------ drivers/bluetooth/hci_uart.h | 1 + 2 files changed, 15 insertions(+), 6 deletions(-) --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -102,7 +102,8 @@ static inline struct sk_buff *hci_uart_d if (!skb) { percpu_down_read(&hu->proto_lock); - if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) + if (test_bit(HCI_UART_PROTO_READY, &hu->flags) || + test_bit(HCI_UART_PROTO_INIT, &hu->flags)) skb = hu->proto->dequeue(hu); percpu_up_read(&hu->proto_lock); @@ -124,7 +125,8 @@ int hci_uart_tx_wakeup(struct hci_uart * if (!percpu_down_read_trylock(&hu->proto_lock)) return 0; - if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) && + !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) goto no_schedule; set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state); @@ -278,7 +280,8 @@ static int hci_uart_send_frame(struct hc percpu_down_read(&hu->proto_lock); - if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) && + !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) { percpu_up_read(&hu->proto_lock); return -EUNATCH; } @@ -585,7 +588,8 @@ static void hci_uart_tty_wakeup(struct t if (tty != hu->tty) return; - if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) + if (test_bit(HCI_UART_PROTO_READY, &hu->flags) || + test_bit(HCI_UART_PROTO_INIT, &hu->flags)) hci_uart_tx_wakeup(hu); } @@ -611,7 +615,8 @@ static void hci_uart_tty_receive(struct percpu_down_read(&hu->proto_lock); - if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) && + !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) { percpu_up_read(&hu->proto_lock); return; } @@ -707,13 +712,16 @@ static int hci_uart_set_proto(struct hci hu->proto = p; - set_bit(HCI_UART_PROTO_READY, &hu->flags); + set_bit(HCI_UART_PROTO_INIT, &hu->flags); err = hci_uart_register_dev(hu); if (err) { return err; } + set_bit(HCI_UART_PROTO_READY, &hu->flags); + clear_bit(HCI_UART_PROTO_INIT, &hu->flags); + return 0; } --- a/drivers/bluetooth/hci_uart.h +++ b/drivers/bluetooth/hci_uart.h @@ -90,6 +90,7 @@ struct hci_uart { #define HCI_UART_REGISTERED 1 #define HCI_UART_PROTO_READY 2 #define HCI_UART_NO_SUSPEND_NOTIFIER 3 +#define HCI_UART_PROTO_INIT 4 /* TX states */ #define HCI_UART_SENDING 1