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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-12-07 12:52:23 -0800
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-12-07 13:04:59 -0800
commit756b9b37cfb2e3dc76b2e43a8c097402ac736e07 (patch)
tree14503068e419723d06b4c56ec6544a907ae3f85a
parent527e9316f8ec44bd53d90fb9f611fa7ffff52bb9 (diff)
SUNRPC: Fix callback channel
The NFSv4.1 callback channel is currently broken because the receive message will keep shrinking because the backchannel receive buffer size never gets reset. The easiest solution to this problem is instead of changing the receive buffer, to rather adjust the copied request. Fixes: 38b7631fbe42 ("nfs4: limit callback decoding to received bytes") Cc: Benjamin Coddington <bcodding@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/callback_xdr.c7
-rw-r--r--net/sunrpc/backchannel_rqst.c8
-rw-r--r--net/sunrpc/svc.c12
3 files changed, 14 insertions, 13 deletions
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index beac58b0e09c..646cdac73488 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -78,8 +78,7 @@ static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
p = xdr_inline_decode(xdr, nbytes);
if (unlikely(p == NULL))
- printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed "
- "or truncated request.\n");
+ printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
return p;
}
@@ -890,7 +889,6 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
struct cb_compound_hdr_arg hdr_arg = { 0 };
struct cb_compound_hdr_res hdr_res = { NULL };
struct xdr_stream xdr_in, xdr_out;
- struct xdr_buf *rq_arg = &rqstp->rq_arg;
__be32 *p, status;
struct cb_process_state cps = {
.drc_status = 0,
@@ -902,8 +900,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
dprintk("%s: start\n", __func__);
- rq_arg->len = rq_arg->head[0].iov_len + rq_arg->page_len;
- xdr_init_decode(&xdr_in, rq_arg, rq_arg->head[0].iov_base);
+ xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c
index 95f82d8d4888..229956bf8457 100644
--- a/net/sunrpc/backchannel_rqst.c
+++ b/net/sunrpc/backchannel_rqst.c
@@ -353,20 +353,12 @@ void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied)
{
struct rpc_xprt *xprt = req->rq_xprt;
struct svc_serv *bc_serv = xprt->bc_serv;
- struct xdr_buf *rq_rcv_buf = &req->rq_rcv_buf;
spin_lock(&xprt->bc_pa_lock);
list_del(&req->rq_bc_pa_list);
xprt_dec_alloc_count(xprt, 1);
spin_unlock(&xprt->bc_pa_lock);
- if (copied <= rq_rcv_buf->head[0].iov_len) {
- rq_rcv_buf->head[0].iov_len = copied;
- rq_rcv_buf->page_len = 0;
- } else {
- rq_rcv_buf->page_len = copied - rq_rcv_buf->head[0].iov_len;
- }
-
req->rq_private_buf.len = copied;
set_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 7fccf9675df8..cc9852897395 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1363,7 +1363,19 @@ bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
memcpy(&rqstp->rq_arg, &req->rq_rcv_buf, sizeof(rqstp->rq_arg));
memcpy(&rqstp->rq_res, &req->rq_snd_buf, sizeof(rqstp->rq_res));
+
+ /* Adjust the argument buffer length */
rqstp->rq_arg.len = req->rq_private_buf.len;
+ if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
+ rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
+ rqstp->rq_arg.page_len = 0;
+ } else if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len +
+ rqstp->rq_arg.page_len)
+ rqstp->rq_arg.page_len = rqstp->rq_arg.len -
+ rqstp->rq_arg.head[0].iov_len;
+ else
+ rqstp->rq_arg.len = rqstp->rq_arg.head[0].iov_len +
+ rqstp->rq_arg.page_len;
/* reset result send buffer "put" position */
resv->iov_len = 0;