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| author | Linus Walleij <linus.walleij@linaro.org> | 2019-09-05 11:40:54 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2019-09-05 11:40:54 +0200 |
| commit | 151a41014bff92f353263cadc051435dc9c3258e (patch) | |
| tree | aa082a0745edd5b7051668f455dfc0ee1e4a9de0 /drivers/hid/usbhid/hiddev.c | |
| parent | ae0755b56da9db4190288155ea884331993ed51b (diff) | |
| parent | 089cf7f6ecb266b6a4164919a2e69bd2f938374a (diff) | |
Merge tag 'v5.3-rc7' into devel
Linux 5.3-rc7
Diffstat (limited to 'drivers/hid/usbhid/hiddev.c')
| -rw-r--r-- | drivers/hid/usbhid/hiddev.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index 55b72573066b..4e11cc6fc34b 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -284,6 +284,14 @@ static int hiddev_open(struct inode *inode, struct file *file) spin_unlock_irq(&list->hiddev->list_lock); mutex_lock(&hiddev->existancelock); + /* + * recheck exist with existance lock held to + * avoid opening a disconnected device + */ + if (!list->hiddev->exist) { + res = -ENODEV; + goto bail_unlock; + } if (!list->hiddev->open++) if (list->hiddev->exist) { struct hid_device *hid = hiddev->hid; @@ -300,6 +308,10 @@ bail_normal_power: hid_hw_power(hid, PM_HINT_NORMAL); bail_unlock: mutex_unlock(&hiddev->existancelock); + + spin_lock_irq(&list->hiddev->list_lock); + list_del(&list->node); + spin_unlock_irq(&list->hiddev->list_lock); bail: file->private_data = NULL; vfree(list); |