lkml.org 
[lkml]   [2018]   [Jul]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.9 086/101] NFSv4: Revert commit 5f83d86cf531d ("NFSv4.x: Fix wraparound issues..")
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trond.myklebust@hammerspace.com>

commit fc40724fc6731d90cc7fb6d62d66135f85a33dd2 upstream.

The correct behaviour for NFSv4 sequence IDs is to wrap around
to the value 0 after 0xffffffff.
See https://tools.ietf.org/html/rfc5661#section-2.10.6.1

Fixes: 5f83d86cf531d ("NFSv4.x: Fix wraparound issues when validing...")
Cc: stable@vger.kernel.org # 4.6+
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfs/callback_proc.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -402,11 +402,8 @@ validate_seqid(const struct nfs4_slot_ta
return htonl(NFS4ERR_SEQ_FALSE_RETRY);
}

- /* Wraparound */
- if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
- if (args->csa_sequenceid == 1)
- return htonl(NFS4_OK);
- } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
+ /* Note: wraparound relies on seq_nr being of type u32 */
+ if (likely(args->csa_sequenceid == slot->seq_nr + 1))
return htonl(NFS4_OK);

/* Misordered request */

\
 
 \ /
  Last update: 2018-07-01 20:10    [W:0.422 / U:0.448 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site