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| author | ChenXiaoSong <chenxiaosong2@huawei.com> | 2022-03-29 14:32:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-13 21:59:14 +0300 |
| commit | 9f0c217469e84e71f7423bce64527c0b56bf9228 (patch) | |
| tree | 679d4e7c968c65cb837c2c95942e0097f4c4c33a /fs | |
| parent | dcd6b1a624c0ffa21034d8b1e02e9d068458f596 (diff) | |
| download | linux-9f0c217469e84e71f7423bce64527c0b56bf9228.tar.xz | |
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 <tao.lyu@epfl.ch>
Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/inode.c | 1 | ||||
| -rw-r--r-- | fs/nfs/nfs4file.c | 2 |
2 files changed, 1 insertions, 2 deletions
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); |