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authorMiklos Szeredi <mszeredi@redhat.com>2016-03-26 23:14:39 +0300
committerTheodore Ts'o <tytso@mit.edu>2016-03-26 23:14:39 +0300
commitbe62a1a8fd116f5cd9e53726601f970e16e17558 (patch)
tree45c57ddc7b03dde0d4262af9f6c91ec5f5a74648 /fs/nfs/inode.c
parentd101a125954eae1d397adda94ca6319485a50493 (diff)
downloadlinux-be62a1a8fd116f5cd9e53726601f970e16e17558.tar.xz
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/inode.c')
-rw-r--r--fs/nfs/inode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 86faecf8f328..847b678af4f0 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -940,7 +940,7 @@ int nfs_open(struct inode *inode, struct file *filp)
{
struct nfs_open_context *ctx;
- ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
+ ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
nfs_file_set_open_context(filp, ctx);