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[PATCH] idmouse cleanup and overflow fix

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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 4244f72436:

    [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>
This commit is contained in:
Al Viro 2005-10-29 11:56:13 +01:00 committed by Linus Torvalds
parent 32b32c2c35
commit 018a2cdf1e
1 changed files with 2 additions and 14 deletions
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16
drivers/usb/misc/idmouse.c
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@ -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;