NFS: Ensure that all nfs lock contexts have a valid open context (15494511) · Commits · 戴 / test

Force the lock context to keep a reference to the parent open context so that we can guarantee the validity of the latter. Signed-off-by:

fs/nfs/inode.c

+9 −4

Original line number	Diff line number	Diff line
		@@ -885,10 +885,14 @@ struct nfs_lock_context nfs_get_lock_context(struct nfs_open_context ctx)
		spin_lock(&inode->i_lock);
		res = __nfs_find_lock_context(ctx);
		if (res == NULL) {
		list_add_tail_rcu(&new->list, &ctx->lock_context.list);
		new->open_context = ctx;
		new->open_context = get_nfs_open_context(ctx);
		if (new->open_context) {
		list_add_tail_rcu(&new->list,
		&ctx->lock_context.list);
		res = new;
		new = NULL;
		} else
		res = ERR_PTR(-EBADF);
		}
		spin_unlock(&inode->i_lock);
		kfree(new);
		@@ -906,6 +910,7 @@ void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
		return;
		list_del_rcu(&l_ctx->list);
		spin_unlock(&inode->i_lock);
		put_nfs_open_context(ctx);
		kfree_rcu(l_ctx, rcu_head);
		}
		EXPORT_SYMBOL_GPL(nfs_put_lock_context);