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| author | Miklos Szeredi <mszeredi@redhat.com> | 2016-03-26 16:14:39 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-03-26 16:14:39 -0400 |
| commit | be62a1a8fd116f5cd9e53726601f970e16e17558 (patch) | |
| tree | 45c57ddc7b03dde0d4262af9f6c91ec5f5a74648 /fs/nfs/nfs4file.c | |
| parent | d101a125954eae1d397adda94ca6319485a50493 (diff) | |
| download | linux-be62a1a8fd116f5cd9e53726601f970e16e17558.tar.gz | |
nfs: use file_dentry()
NFS may be used as lower layer of overlayfs and accessing f_path.dentry can
lead to a crash.
Fix by replacing direct access of file->f_path.dentry with the
file_dentry() accessor, which will always return a native object.
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Tested-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: <stable@vger.kernel.org> # v4.2
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfs/nfs4file.c')
| -rw-r--r-- | fs/nfs/nfs4file.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index 57ca1c8039c1..2a9ff14cfb3b 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -26,7 +26,7 @@ static int nfs4_file_open(struct inode *inode, struct file *filp) { struct nfs_open_context *ctx; - struct dentry *dentry = filp->f_path.dentry; + struct dentry *dentry = file_dentry(filp); struct dentry *parent = NULL; struct inode *dir; unsigned openflags = filp->f_flags; @@ -57,7 +57,7 @@ nfs4_file_open(struct inode *inode, struct file *filp) parent = dget_parent(dentry); dir = d_inode(parent); - ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); + ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode); err = PTR_ERR(ctx); if (IS_ERR(ctx)) goto out; |