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firewire: add minor number range check to fw_device_init()

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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 <[email protected]>
Suggested-by: Stefan Richter <[email protected]>
Acked-by: Stefan Richter <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Tejun Heo 2013-02-27 17:04:04 -08:00 • committed by Linus Torvalds
commit 3bec60d511
1 changed files with 4 additions and 0 deletions
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4
drivers/firewire/core-device.c
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@ -1020,6 +1020,10 @@ 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)