Patch "nfsd4: disallow SEEK with special stateids" has been added to the 4.0-stable tree

Patch "nfsd4: disallow SEEK with special stateids" has been added to the 4.0-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    nfsd4: disallow SEEK with special stateids

to the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsd4-disallow-seek-with-special-stateids.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 980608fb50aea34993ba956b71cd4602aa42b14b Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Tue, 21 Apr 2015 15:25:39 -0400
Subject: nfsd4: disallow SEEK with special stateids

From: "J. Bruce Fields" <bfields@redhat.com>

commit 980608fb50aea34993ba956b71cd4602aa42b14b upstream.

If the client uses a special stateid then we'll pass a NULL file to
vfs_llseek.

Fixes: 24bab491220f " NFSD: Implement SEEK"
Cc: Anna Schumaker <Anna.Schumaker@Netapp.com>
Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfsd/nfs4proc.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1071,6 +1071,8 @@ nfsd4_seek(struct svc_rqst *rqstp, struc
 		dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
 		return status;
 	}
+	if (!file)
+		return nfserr_bad_stateid;
 
 	switch (seek->seek_whence) {
 	case NFS4_CONTENT_DATA:


Patches currently in stable-queue which might be from bfields@redhat.com are

queue-4.0/nfsd4-disallow-seek-with-special-stateids.patch
queue-4.0/nfsd-eliminate-nfsd_debug.patch
queue-4.0/nfsd-fix-nsfd-startup-race-triggering-bug_on.patch
queue-4.0/nfsd4-fix-read-permission-checking.patch
queue-4.0/nfsd4-disallow-allocate-with-special-stateids.patch