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ipmi: ipmi_devintf: compat_ioctl method fails 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.

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Benjamin LaHaise 2013-05-16 14:04:27 -05:00 committed by Linus Torvalds
parent 0849bfece0
commit 6368087e85
1 changed files with 13 additions and 1 deletions
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14
drivers/char/ipmi/ipmi_devintf.c
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@ -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,