diff options
Diffstat (limited to 'fs/configfs/file.c')
| -rw-r--r-- | fs/configfs/file.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/fs/configfs/file.c b/fs/configfs/file.c index 2f63bf3a7325..0ad32150611e 100644 --- a/fs/configfs/file.c +++ b/fs/configfs/file.c @@ -91,7 +91,10 @@ static ssize_t configfs_read_iter(struct kiocb *iocb, struct iov_iter *to) } pr_debug("%s: count = %zd, pos = %lld, buf = %s\n", __func__, iov_iter_count(to), iocb->ki_pos, buffer->page); - retval = copy_to_iter(buffer->page, buffer->count, to); + if (iocb->ki_pos >= buffer->count) + goto out; + retval = copy_to_iter(buffer->page + iocb->ki_pos, + buffer->count - iocb->ki_pos, to); iocb->ki_pos += retval; if (retval == 0) retval = -EFAULT; @@ -162,7 +165,10 @@ static ssize_t configfs_bin_read_iter(struct kiocb *iocb, struct iov_iter *to) buffer->needs_read_fill = 0; } - retval = copy_to_iter(buffer->bin_buffer, buffer->bin_buffer_size, to); + if (iocb->ki_pos >= buffer->bin_buffer_size) + goto out; + retval = copy_to_iter(buffer->bin_buffer + iocb->ki_pos, + buffer->bin_buffer_size - iocb->ki_pos, to); iocb->ki_pos += retval; if (retval == 0) retval = -EFAULT; @@ -171,6 +177,7 @@ out: return retval; } +/* Fill @buffer with data coming from @from. */ static int fill_write_buffer(struct configfs_buffer *buffer, struct iov_iter *from) { @@ -214,7 +221,7 @@ static ssize_t configfs_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; struct configfs_buffer *buffer = file->private_data; - ssize_t len; + int len; mutex_lock(&buffer->mutex); len = fill_write_buffer(buffer, from); @@ -272,7 +279,9 @@ static ssize_t configfs_bin_write_iter(struct kiocb *iocb, buffer->bin_buffer_size = end_offset; } - len = copy_from_iter(buffer->bin_buffer, buffer->bin_buffer_size, from); + len = copy_from_iter(buffer->bin_buffer + iocb->ki_pos, + buffer->bin_buffer_size - iocb->ki_pos, from); + iocb->ki_pos += len; out: mutex_unlock(&buffer->mutex); return len ? : -EFAULT; |