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path: root/drivers/md/dm-ioctl.c
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Diffstat (limited to 'drivers/md/dm-ioctl.c')
-rw-r--r--drivers/md/dm-ioctl.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 4aa1f78b78f..9c491397a51 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/dm-ioctl.h>
#include <linux/hdreg.h>
+#include <linux/compat.h>
#include <asm/uaccess.h>
@@ -1350,10 +1351,10 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param)
{
struct dm_ioctl tmp, *dmi;
- if (copy_from_user(&tmp, user, sizeof(tmp)))
+ if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data)))
return -EFAULT;
- if (tmp.data_size < sizeof(tmp))
+ if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data)))
return -EINVAL;
dmi = vmalloc(tmp.data_size);
@@ -1474,8 +1475,18 @@ static long dm_ctl_ioctl(struct file *file, uint command, ulong u)
return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u);
}
+#ifdef CONFIG_COMPAT
+static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u)
+{
+ return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u));
+}
+#else
+#define dm_compat_ctl_ioctl NULL
+#endif
+
static const struct file_operations _ctl_fops = {
.unlocked_ioctl = dm_ctl_ioctl,
+ .compat_ioctl = dm_compat_ctl_ioctl,
.owner = THIS_MODULE,
};