Re: [PATCH] unserialized task->files changing

[Christoph Hellwig <hch@infradead.org>]

On Tue, Aug 08, 2006 at 02:07:49PM +0400, Kirill Korotaev wrote:
> Fixed race on put_files_struct on exec with proc.
> Restoring files on current on error path may lead
> to proc having a pointer to already kfree-d files_struct.

This is three times the exact same code sequence, it should probably go into
a helper:

void reset_current_files(struct files_struct *files)
{
	struct files_struct *old = current->files;

	task_lock(current);
	current->files = files;
	task_unlock(current);
	put_files_struct(old);
}