[PATCH] idmouse cleanup and overflow fix

switched to simple_read_from_buffer(), killed broken use of min().
Incidentally, that use of min() had been fixed once, only to be
reintroduced in commit 4244f72436ab77c3c29a6447af81734ab3925d85:

    [PATCH] USB: upgrade of the idmouse driver

[snip]
-       if (count > IMGSIZE - *ppos)
-               count = IMGSIZE - *ppos;
+       count = min ((loff_t)count, IMGSIZE - (*ppos));

Note the lovely use of cast to shut the warning about misuse of min()
up...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 14 deletions

diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c
index 3944a55ed74c..1dc3e0f73014 100644
--- a/drivers/usb/misc/idmouse.c
+++ b/drivers/usb/misc/idmouse.c
@@ -319,20 +319,8 @@ static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count
                 return -ENODEV;
         }
 
-        if (*ppos >= IMGSIZE) {
-                up (&dev->sem);
-                return 0;
-        }
-
-        count = min ((loff_t)count, IMGSIZE - (*ppos));
-
-        if (copy_to_user (buffer, dev->bulk_in_buffer + *ppos, count)) {
-                result = -EFAULT;
-        } else {
-                result = count;
-                *ppos += count;
-        }
-
+        result = simple_read_from_buffer(buffer, count, ppos,
+                                        dev->bulk_in_buffer, IMGSIZE);
         /* unlock the device */
         up(&dev->sem);
         return result;