From f4ad3d38d49dc0c4c911e31d8b884d5b74362b6e Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Mon, 15 Dec 2014 12:57:00 +1100
Subject: md: remove unnecessary 'buf' from get_bitmap_file.
'buf' is only used because d_path fills from the end of the
buffer instead of from the start.
We don't need a separate buf to handle that, we just need to use
memmove() to move the string to the start.
Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/md/md.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
(limited to 'drivers/md/md.c')
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 5438834bf54d..bddecc01c333 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5502,7 +5502,7 @@ static int get_array_info(struct mddev *mddev, void __user *arg)
static int get_bitmap_file(struct mddev *mddev, void __user * arg)
{
mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
- char *ptr, *buf = NULL;
+ char *ptr;
int err = -ENOMEM;
file = kmalloc(sizeof(*file), GFP_NOIO);
@@ -5516,23 +5516,19 @@ static int get_bitmap_file(struct mddev *mddev, void __user * arg)
goto copy_out;
}
- buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
- if (!buf)
- goto out;
-
ptr = d_path(&mddev->bitmap->storage.file->f_path,
- buf, sizeof(file->pathname));
+ file->pathname, sizeof(file->pathname));
if (IS_ERR(ptr))
goto out;
- strcpy(file->pathname, ptr);
+ memmove(file->pathname, ptr,
+ sizeof(file->pathname)-(ptr-file->pathname));
copy_out:
err = 0;
if (copy_to_user(arg, file, sizeof(*file)))
err = -EFAULT;
out:
- kfree(buf);
kfree(file);
return err;
}
--
cgit