Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.17 182/220] NFSv4: Revert commit 5f83d86cf531d ("NFSv4.x: Fix wraparound issues..") | Date | Sun, 1 Jul 2018 18:23:26 +0200 |
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4.17-stable review patch. If anyone has any objections, please let me know.
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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 @@ -420,11 +420,8 @@ 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 */
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