firewire: add minor number range check to fw_device_init()

commit 3bec60d511179853138836ae6e1b61fe34d9235f upstream.

fw_device_init() didn't check whether the allocated minor number isn't
too large.  Fail if it goes overflows MINORBITS.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 9f661e0..812cea3 100644 (file)
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -995,6 +995,10 @@ static void fw_device_init(struct work_struct *work)
        ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ?
              idr_get_new(&fw_device_idr, device, &minor) :
              -ENOMEM;
+       if (minor >= 1 << MINORBITS) {
+               idr_remove(&fw_device_idr, minor);
+               minor = -ENOSPC;
+       }
        up_write(&fw_device_rwsem);
 
        if (ret < 0)