linux-kernel - [PATCH 12.5/62] firewire: add minor number range check to fw_device

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Message-ID: <20130204165732.GG27963@mtj.dyndns.org>
Date:	Mon, 4 Feb 2013 08:57:32 -0800
From:	Tejun Heo <tj@...nel.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	bfields@...ldses.org, skinsbursky@...allels.com,
	ebiederm@...ssion.com, jmorris@...ei.org, axboe@...nel.dk,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net
Subject: [PATCH 12.5/62] firewire: add minor number range check to
 fw_device_init()

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>
Cc: stable@...r.kernel.org
---
 drivers/firewire/core-device.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -1020,6 +1020,10 @@ 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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