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| author | Loic Poulain <loic.poulain@intel.com> | 2016-04-04 10:48:13 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-06-15 15:51:47 +0200 |
| commit | b85483c524e3f8dda532b5c13b1fb22a5404554c (patch) | |
| tree | a338fcf06a9cef0fec4ea93ee50d308ecf16203d | |
| parent | 94e3230bf179f9700e160c0f4a05305cc5299a62 (diff) | |
| download | linux-stable-b85483c524e3f8dda532b5c13b1fb22a5404554c.tar.gz linux-stable-b85483c524e3f8dda532b5c13b1fb22a5404554c.tar.bz2 linux-stable-b85483c524e3f8dda532b5c13b1fb22a5404554c.zip | |
Bluetooth: hci_ldisc: Fix null pointer derefence in case of early data
commit 84cb3df02aea4b00405521e67c4c67c2d525c364 upstream.
HCI_UART_PROTO_SET flag is set before hci_uart_set_proto call. If we
receive data from tty layer during this procedure, proto pointer may
not be assigned yet, leading to null pointer dereference in rx method
hci_uart_tty_receive.
This patch fixes this issue by introducing HCI_UART_PROTO_READY flag in
order to avoid any proto operation before proto opening and assignment.
Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/bluetooth/hci_ldisc.c | 11 | ||||
| -rw-r--r-- | drivers/bluetooth/hci_uart.h | 1 |
2 files changed, 8 insertions, 4 deletions
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index c4d2f0e48685..3f6074f7d4bc 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -225,7 +225,7 @@ static int hci_uart_flush(struct hci_dev *hdev) tty_ldisc_flush(tty); tty_driver_flush_buffer(tty); - if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) + if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) hu->proto->flush(hu); return 0; @@ -340,7 +340,7 @@ static void hci_uart_tty_close(struct tty_struct *tty) cancel_work_sync(&hu->write_work); - if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) { + if (test_and_clear_bit(HCI_UART_PROTO_READY, &hu->flags)) { if (hdev) { if (test_bit(HCI_UART_REGISTERED, &hu->flags)) hci_unregister_dev(hdev); @@ -348,6 +348,7 @@ static void hci_uart_tty_close(struct tty_struct *tty) } hu->proto->close(hu); } + clear_bit(HCI_UART_PROTO_SET, &hu->flags); kfree(hu); } @@ -374,7 +375,7 @@ static void hci_uart_tty_wakeup(struct tty_struct *tty) if (tty != hu->tty) return; - if (test_bit(HCI_UART_PROTO_SET, &hu->flags)) + if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) hci_uart_tx_wakeup(hu); } @@ -397,7 +398,7 @@ static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *f if (!hu || tty != hu->tty) return; - if (!test_bit(HCI_UART_PROTO_SET, &hu->flags)) + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) return; spin_lock(&hu->rx_lock); @@ -474,9 +475,11 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id) return err; hu->proto = p; + set_bit(HCI_UART_PROTO_READY, &hu->flags); err = hci_uart_register_dev(hu); if (err) { + clear_bit(HCI_UART_PROTO_READY, &hu->flags); p->close(hu); return err; } diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h index 12df101ca942..51ecb664d961 100644 --- a/drivers/bluetooth/hci_uart.h +++ b/drivers/bluetooth/hci_uart.h @@ -81,6 +81,7 @@ struct hci_uart { /* HCI_UART proto flag bits */ #define HCI_UART_PROTO_SET 0 #define HCI_UART_REGISTERED 1 +#define HCI_UART_PROTO_READY 2 /* TX states */ #define HCI_UART_SENDING 1 |