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authorChan-yeol Park <chanyeol.park@samsung.com>2013-04-02 16:24:21 +0400
committerJohan Hedberg <johan.hedberg@intel.com>2013-04-04 13:35:58 +0400
commitc2578202919ace314908306346b99796d46aab64 (patch)
treecf11bd8fc4bbca409b67d4b35c28aa35aa19959b /drivers/bluetooth/hci_h4.c
parentd4299ce6b33c0afd22cf6a170cfaf89c63d1114d (diff)
downloadlinux-c2578202919ace314908306346b99796d46aab64.tar.xz
Bluetooth: Fix H4 crash from incoming UART packets
This patch adds a check HCI_UART_REGISTERED before reading UART data in the HCI UART H4 driver. UART data could arrive when inside the hci_uart_tty_ioctl function after calling test_and_set_bit for HCI_UART_PROTO_SET but before the hci_uart_set_proto function has returned. Backtrace: [<c05f27ec>] (hci_recv_stream_fragment+0x0/0x74) from [<c04126f4>] (h4_recv+0x18/0x40) r7:eb1d4d1c r6:eb7683b0 r5:eae8e800 r4:0000000c [<c04126dc>] (h4_recv+0x0/0x40) from [<c0411870>] (hci_uart_tty_receive+0x6c/0x94) r5:eae8e800 r4:eb768380 [<c0411804>] (hci_uart_tty_receive+0x0/0x94) from [<c027be88>] (flush_to_ldisc+0x16c/0x17c) r6:eae8e8d8 r5:eae8e800 r4:eae8e8c8 [<c027bd1c>] (flush_to_ldisc+0x0/0x17c) from [<c0050ae8>] (process_one_work+0x144/0x4d4) [<c00509a4>] (process_one_work+0x0/0x4d4) from [<c0051208>] (worker_thread+0x180/0x370) [<c0051088>] (worker_thread+0x0/0x370) from [<c005617c>] (kthread+0x90/0x9c) [<c00560ec>] (kthread+0x0/0x9c) from [<c003a3a0>] (do_exit+0x0/0x7ec) Signed-off-by: Chan-yeol Park <chanyeol.park@samsung.com> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Diffstat (limited to 'drivers/bluetooth/hci_h4.c')
-rw-r--r--drivers/bluetooth/hci_h4.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c
index c60623f206d4..8ae9f1ea2bb5 100644
--- a/drivers/bluetooth/hci_h4.c
+++ b/drivers/bluetooth/hci_h4.c
@@ -153,6 +153,9 @@ static int h4_recv(struct hci_uart *hu, void *data, int count)
{
int ret;
+ if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
+ return -EUNATCH;
+
ret = hci_recv_stream_fragment(hu->hdev, data, count);
if (ret < 0) {
BT_ERR("Frame Reassembly Failed");