diff options
| author | Tejun Heo <tj@kernel.org> | 2013-02-27 17:04:04 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-04 06:03:35 +0800 |
| commit | fd9471ef7e6ee38a7f29f5556928ddf4824f8bdd (patch) | |
| tree | f4cdca3d713ce2394aab9e2d527a6454b4cb5c53 | |
| parent | ca4e7610b166ff557a5f357bac6f12ec66a1ac1a (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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 3873d535b28..af3e8aa5eed 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -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) |