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authorJ. Bruce Fields <bfields@redhat.com>2013-11-20 02:32:43 +0400
committerJ. Bruce Fields <bfields@redhat.com>2013-11-20 03:06:54 +0400
commit365da4adebb1c012febf81019ad3dc5bb52e2a13 (patch)
treef538139477c4104f66321c0446e57332fed6289c /fs
parent987da4791052fa298b7cfcde4dea9f6f2bbc786b (diff)
downloadlinux-365da4adebb1c012febf81019ad3dc5bb52e2a13.tar.xz
nfsd4: fix xdr decoding of large non-write compounds
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. Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfs4xdr.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 088de1355e93..ee7237f99f54 100644
--- 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;
@@ -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);