From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Fri, 17 Jun 2016 20:48:28 +0000 (-0400)
Subject: NFS: Fix potential race in nfs_fhget()
X-Git-Tag: v4.7-rc6~23^2~3
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=916ec34d0bafe95b977908acd8b3153c9df6f9d6;p=karo-tx-linux.git

NFS: Fix potential race in nfs_fhget()

If we don't set the mode correctly in nfs_init_locked(), then there is
potential for a race with a second call to nfs_fhget that will cause
inode aliasing.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 52e7d6869e3b..dda689d7a8a7 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -282,6 +282,7 @@ nfs_init_locked(struct inode *inode, void *opaque)
 	struct nfs_fattr	*fattr = desc->fattr;
 
 	set_nfs_fileid(inode, fattr->fileid);
+	inode->i_mode = fattr->mode;
 	nfs_copy_fh(NFS_FH(inode), desc->fh);
 	return 0;
 }