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 06:06:41 +0800 |
| commit | ef7a6c344031cd99e16a116a7984d9428dce8401 (patch) | |
| tree | 04aaad8121bc1a1cd6e33efb2fa02887cc0da4e2 | |
| parent | 303ee54c72f488b90c2355977c1619a08db6ed9c (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 68109e9bb04e..04ebeaf8cffe 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -999,6 +999,10 @@ 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) |