nfs: use file_dentry()

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commit be62a1a8fd upstream.

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: 4bacc9c923 ("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: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Miklos Szeredi 2016-03-26 16:14:39 -04:00 • committed by Greg Kroah-Hartman

parent c452dfc332

commit fda9797a6a

3 changed files with 6 additions and 6 deletions

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6

fs/nfs/dir.c

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2

fs/nfs/inode.c

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4

fs/nfs/nfs4file.c

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