iov_iter: fix the uaccess area in copy_compat_iovec_from_user

sizeof needs to be called on the compat pointer, not the native one.

Fixes: 89cd35c ("iov_iter: transparently handle compat iovecs in import_iovec")
Reported-by: David Laight <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Al Viro <[email protected]>

Author: Christoph Hellwig

lib/iov_iter.c

@@ -1658,7 +1658,7 @@ static int copy_compat_iovec_from_user(struct iovec *iov,
 		(const struct compat_iovec __user *)uvec;
 	int ret = -EFAULT, i;
 
-	if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
+	if (!user_access_begin(uiov, nr_segs * sizeof(*uiov)))
 		return -EFAULT;
 
 	for (i = 0; i < nr_segs; i++) {