From 9f0c217469e84e71f7423bce64527c0b56bf9228 Mon Sep 17 00:00:00 2001 From: ChenXiaoSong Date: Tue, 29 Mar 2022 19:32:07 +0800 Subject: Revert "NFSv4: Handle the special Linux file open access mode" [ Upstream commit ab0fc21bc7105b54bafd85bd8b82742f9e68898a ] This reverts commit 44942b4e457beda00981f616402a1a791e8c616e. After secondly opening a file with O_ACCMODE|O_DIRECT flags, nfs4_valid_open_stateid() will dereference NULL nfs4_state when lseek(). Reproducer: 1. mount -t nfs -o vers=4.2 $server_ip:/ /mnt/ 2. fd = open("/mnt/file", O_ACCMODE|O_DIRECT|O_CREAT) 3. close(fd) 4. fd = open("/mnt/file", O_ACCMODE|O_DIRECT) 5. lseek(fd) Reported-by: Lyu Tao Signed-off-by: ChenXiaoSong Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/inode.c | 1 - fs/nfs/nfs4file.c | 2 +- 2 files changed, 1 insertion(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 410f87bc48cc..f4f75db7a825 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -1167,7 +1167,6 @@ int nfs_open(struct inode *inode, struct file *filp) nfs_fscache_open_file(inode, filp); return 0; } -EXPORT_SYMBOL_GPL(nfs_open); /* * This function is called whenever some part of NFS notices that diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index c91565227ea2..8f35b5e13e93 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -51,7 +51,7 @@ nfs4_file_open(struct inode *inode, struct file *filp) return err; if ((openflags & O_ACCMODE) == 3) - return nfs_open(inode, filp); + openflags--; /* We can't create new files here */ openflags &= ~(O_CREAT|O_EXCL); -- cgit v1.2.3