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| author |   Szymon Janc <szymon.janc@codecoup.pl> | 2016-09-09 20:24:40 +0200 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2016-09-19 20:19:34 +0200 |
| commit | 83ebb9ec734e9e768a9fae469e4a7ed1762ef43a (patch) | |
| tree | 59cfc1c706c723fcbd36afd371ea6abf974b6f2f /net/bluetooth/smp.c | |
| parent | Bluetooth: Use kzalloc instead of kmalloc/memset (diff) | |
| download | linux-dev-83ebb9ec734e9e768a9fae469e4a7ed1762ef43a.tar.xz linux-dev-83ebb9ec734e9e768a9fae469e4a7ed1762ef43a.zip | |
Bluetooth: Fix not registering BR/EDR SMP channel with force_bredr flag
If force_bredr is set SMP BR/EDR channel should also be for non-SC
capable controllers. Since hcidev flag is persistent wrt power toggle
it can be already set when calling smp_register(). This resulted in
SMP BR/EDR channel not being registered even if HCI_FORCE_BREDR_SMP
flag was set.
This also fix NULL pointer dereference when trying to disable
force_bredr after power cycle.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000388
IP: [<ffffffffc0493ad8>] smp_del_chan+0x18/0x80 [bluetooth]
Call Trace:
[<ffffffffc04950ca>] force_bredr_smp_write+0xba/0x100 [bluetooth]
[<ffffffff8133be14>] full_proxy_write+0x54/0x90
[<ffffffff81245967>] __vfs_write+0x37/0x160
[<ffffffff813617f7>] ? selinux_file_permission+0xd7/0x110
[<ffffffff81356fbd>] ? security_file_permission+0x3d/0xc0
[<ffffffff810eb5b2>] ? percpu_down_read+0x12/0x50
[<ffffffff812462a5>] vfs_write+0xb5/0x1a0
[<ffffffff812476f5>] SyS_write+0x55/0xc0
[<ffffffff817eb872>] entry_SYSCALL_64_fastpath+0x1a/0xa4
Code: 48 8b 45 f0 eb c1 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
44 00 00 f6 05 c6 3b 02 00 04 55 48 89 e5 41 54 53 49 89 fc 75
4b
<49> 8b 9c 24 88 03 00 00 48 85 db 74 31 49 c7 84 24 88 03 00 00
RIP [<ffffffffc0493ad8>] smp_del_chan+0x18/0x80 [bluetooth]
RSP <ffff8802aee3bd90>
CR2: 0000000000000388
Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/smp.c')
| -rw-r--r-- | net/bluetooth/smp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 4c1a16a96ae5..43faf2aea2ab 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -3387,7 +3387,10 @@ int smp_register(struct hci_dev *hdev) if (!lmp_sc_capable(hdev)) { debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, hdev, &force_bredr_smp_fops); - return 0; + + /* Flag can be already set here (due to power toggle) */ + if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) + return 0; } if (WARN_ON(hdev->smp_bredr_data)) { |