linux-kernel - [PATCH] ipmi: ipmi_devintf: compat_ioctl method failes to take ipmi

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Message-ID: <20130513193934.GA17394@kvack.org>
Date:	Mon, 13 May 2013 15:39:34 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Corey Minyard <minyard@....org>
Cc:	openipmi-developer@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] ipmi: ipmi_devintf: compat_ioctl method failes to take ipmi_mutex

When a 32 bit version of ipmitool is used on a 64 bit kernel, the
ipmi_devintf code fails to correctly acquire ipmi_mutex.  This results in
incomplete data being retrieved in some cases, or other possible failures.
Add a wrapper around compat_ipmi_ioctl() to take ipmi_mutex to fix this.
This is probably a candidate for -stable as well.

Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
---
 drivers/char/ipmi/ipmi_devintf.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
index 9eb360f..d5a5f02 100644
--- a/drivers/char/ipmi/ipmi_devintf.c
+++ b/drivers/char/ipmi/ipmi_devintf.c
@@ -837,13 +837,25 @@ static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
 		return ipmi_ioctl(filep, cmd, arg);
 	}
 }
+
+static long unlocked_compat_ipmi_ioctl(struct file *filep, unsigned int cmd,
+				       unsigned long arg)
+{
+	int ret;
+
+	mutex_lock(&ipmi_mutex);
+	ret = compat_ipmi_ioctl(filep, cmd, arg);
+	mutex_unlock(&ipmi_mutex);
+
+	return ret;
+}
 #endif
 
 static const struct file_operations ipmi_fops = {
 	.owner		= THIS_MODULE,
 	.unlocked_ioctl	= ipmi_unlocked_ioctl,
 #ifdef CONFIG_COMPAT
-	.compat_ioctl   = compat_ipmi_ioctl,
+	.compat_ioctl   = unlocked_compat_ipmi_ioctl,
 #endif
 	.open		= ipmi_open,
 	.release	= ipmi_release,
-- 
1.7.4.1


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