This is a note to let you know that I've just added the patch titled
nfsd4: fix xdr decoding of large non-write compounds
to the 3.12-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-fix-xdr-decoding-of-large-non-write-compounds.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 365da4adebb1c012febf81019ad3dc5bb52e2a13 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
Date: Tue, 19 Nov 2013 17:32:43 -0500
Subject: nfsd4: fix xdr decoding of large non-write compounds
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
commit 365da4adebb1c012febf81019ad3dc5bb52e2a13 upstream.
This fixes a regression from 247500820ebd02ad87525db5d9b199e5b66f6636
"nfsd4: fix decoding of compounds across page boundaries". The previous
code was correct: argp->pagelist is initialized in
nfs4svc_deocde_compoundargs to rqstp->rq_arg.pages, and is therefore a
pointer to the page *after* the page we are currently decoding.
The reason that patch nevertheless fixed a problem with decoding
compounds containing write was a bug in the write decoding introduced by
5a80a54d21c96590d013378d8c5f65f879451ab4 "nfsd4: reorganize write
decoding", after which write decoding no longer adhered to the rule that
argp->pagelist point to the next page.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4xdr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -141,8 +141,8 @@ xdr_error: \
static void next_decode_page(struct nfsd4_compoundargs *argp)
{
- argp->pagelist++;
argp->p = page_address(argp->pagelist[0]);
+ argp->pagelist++;
if (argp->pagelen < PAGE_SIZE) {
argp->end = argp->p + (argp->pagelen>>2);
argp->pagelen = 0;
@@ -1209,6 +1209,7 @@ nfsd4_decode_write(struct nfsd4_compound
len -= pages * PAGE_SIZE;
argp->p = (__be32 *)page_address(argp->pagelist[0]);
+ argp->pagelist++;
argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
}
argp->p += XDR_QUADLEN(len);
Patches currently in stable-queue which might be from bfields@xxxxxxxxxx are
queue-3.12/nfsd4-fix-discarded-security-labels-on-setattr.patch
queue-3.12/nfsd-split-up-nfsd_setattr.patch
queue-3.12/nfsd-make-sure-to-balance-get-put_write_access.patch
queue-3.12/nfsd-return-better-errors-to-exportfs.patch
queue-3.12/nfsd4-fix-xdr-decoding-of-large-non-write-compounds.patch
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