diff options
| author | Tejun Heo <tj@kernel.org> | 2013-02-27 17:04:04 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-03-06 03:24:16 +0000 |
| commit | 507b2ac935cfe53dbe3a61d61254154e4829c2e4 (patch) | |
| tree | 73fb79f30bf347cca46786bd81d1b15f091e20e6 | |
| parent | a51db52c68e3ad5c718c1915d28086b2c0ef8642 (diff) | |
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: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | drivers/firewire/core-device.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index f3b890da1e87..1f3dd5117ed3 100644 --- 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) |