Commit 365da4ad authored Nov 19, 2013 by J. Bruce Fields

nfsd4: fix xdr decoding of large non-write compounds



This fixes a regression from 24750082
"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
5a80a54d "nfsd4: reorganize write
decoding", after which write decoding no longer adhered to the rule that
argp->pagelist point to the next page.

Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

parent 987da479

fs/nfsd/nfs4xdr.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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;
		@@ -1229,6 +1229,7 @@ nfsd4_decode_write(struct nfsd4_compoundargs argp, struct nfsd4_write write)
		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);