From 154945112dac10b7109d816275f3e4896b0b064e Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 7 Apr 2019 13:59:10 -0400 Subject: NFS: Ensure that all nfs lock contexts have a valid open context 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: Trond Myklebust Signed-off-by: Anna Schumaker --- fs/nfs/inode.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 414a90d48493..efc45f22c581 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -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; - res = new; - new = NULL; + 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); -- cgit v1.2.3