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| author | Jiri Kosina <jkosina@suse.cz> | 2009-10-12 11:25:56 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2009-10-12 11:25:56 +0200 |
| commit | b0e14951ee0f6c29abc64b92ec7075a159ede37c (patch) | |
| tree | aa10393c1f54a2342fbd4d3624d6e68de376cd8d /drivers | |
| parent | HID: fix kerneldoc comment for hid_input_report() (diff) | |
| download | linux-b0e14951ee0f6c29abc64b92ec7075a159ede37c.tar.xz linux-b0e14951ee0f6c29abc64b92ec7075a159ede37c.zip | |
HID: fix possible deadlock in hidraw_read
If the loop in hidraw_read() loops more than once, then we might
end up trying to acquire already locked mutex, casuing a deadlock.
Reported-by: iceberg <iceberg@ispras.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hid/hidraw.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 0c6639ea03dd..b079a9c59958 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -47,10 +47,9 @@ static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, char *report; DECLARE_WAITQUEUE(wait, current); - while (ret == 0) { - - mutex_lock(&list->read_mutex); + mutex_lock(&list->read_mutex); + while (ret == 0) { if (list->head == list->tail) { add_wait_queue(&list->hidraw->wait, &wait); set_current_state(TASK_INTERRUPTIBLE); |