linux-kernel - [ 20/46] firewire: add minor number range check to fw_device

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Message-Id: <20130301194434.373943638@linuxfoundation.org>
Date:	Fri,  1 Mar 2013 11:45:08 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 20/46] firewire: add minor number range check to fw_device_init()

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tejun Heo <tj@...nel.org>

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@...nel.org>
Suggested-by: Stefan Richter <stefanr@...6.in-berlin.de>
Acked-by: Stefan Richter <stefanr@...6.in-berlin.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/firewire/core-device.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -999,6 +999,10 @@ static void fw_device_init(struct work_s
 	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)


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