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NFS client bugfixes for Linux 5.1 

Highlights include:
 
 Bugfixes:
 - Fix an Oops in SUNRPC back channel tracepoints
 - Fix a SUNRPC client regression when handling oversized replies
 - Fix the minimal size for SUNRPC reply buffer allocation
 - rpc_decode_header() must always return a non-zero value on error
 - Fix a typo in pnfs_update_layout()
 
 Cleanups:
 - Remove redundant check for the reply length in call_decode()
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Merge tag 'nfs-for-5.1-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Bugfixes:
   - Fix an Oops in SUNRPC back channel tracepoints
   - Fix a SUNRPC client regression when handling oversized replies
   - Fix the minimal size for SUNRPC reply buffer allocation
   - rpc_decode_header() must always return a non-zero value on error
   - Fix a typo in pnfs_update_layout()

  Cleanup:
   - Remove redundant check for the reply length in call_decode()"

* tag 'nfs-for-5.1-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  SUNRPC: Remove redundant check for the reply length in call_decode()
  SUNRPC: Handle the SYSTEM_ERR rpc error
  SUNRPC: rpc_decode_header() must always return a non-zero value on error
  SUNRPC: Use the ENOTCONN error on socket disconnect
  SUNRPC: Fix the minimal size for reply buffer allocation
  SUNRPC: Fix a client regression when handling oversized replies
  pNFS: Fix a typo in pnfs_update_layout
  fix null pointer deref in tracepoints in back channel
This commit is contained in:
Linus Torvalds 2019-03-16 12:28:18 -07:00
parent a9c55d58bc 5e3863fd59
commit 465c209db8
5 changed files with 21 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/pnfs.c
View File

@ -1889,7 +1889,7 @@ lookup_again:
atomic_read(&lo->plh_outstanding) != 0) {
spin_unlock(&ino->i_lock);
lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
atomic_read(&lo->plh_outstanding)));
!atomic_read(&lo->plh_outstanding)));
if (IS_ERR(lseg) || !list_empty(&lo->plh_segs))
goto out_put_layout_hdr;
pnfs_put_layout_hdr(lo);

6
include/trace/events/sunrpc.h
View File

@ -712,7 +712,8 @@ TRACE_EVENT(xprt_transmit,
TP_fast_assign(
__entry->task_id = rqst->rq_task->tk_pid;
__entry->client_id = rqst->rq_task->tk_client->cl_clid;
__entry->client_id = rqst->rq_task->tk_client ?
rqst->rq_task->tk_client->cl_clid : -1;
__entry->xid = be32_to_cpu(rqst->rq_xid);
__entry->seqno = rqst->rq_seqno;
__entry->status = status;
@ -742,7 +743,8 @@ TRACE_EVENT(xprt_enq_xmit,
TP_fast_assign(
__entry->task_id = task->tk_pid;
__entry->client_id = task->tk_client->cl_clid;
__entry->client_id = task->tk_client ?
task->tk_client->cl_clid : -1;
__entry->xid = be32_to_cpu(task->tk_rqstp->rq_xid);
__entry->seqno = task->tk_rqstp->rq_seqno;
__entry->stage = stage;

32
net/sunrpc/clnt.c
View File

@ -1730,7 +1730,12 @@ call_allocate(struct rpc_task *task)
req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +
proc->p_arglen;
req->rq_callsize <<= 2;
req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + proc->p_replen;
/*
* Note: the reply buffer must at minimum allocate enough space
* for the 'struct accepted_reply' from RFC5531.
*/
req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + \
max_t(size_t, proc->p_replen, 2);
req->rq_rcvsize <<= 2;
status = xprt->ops->buf_alloc(task);
@ -2387,9 +2392,6 @@ call_decode(struct rpc_task *task)
WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf,
sizeof(req->rq_rcv_buf)) != 0);
if (req->rq_rcv_buf.len < 12)
goto out_retry;
xdr_init_decode(&xdr, &req->rq_rcv_buf,
req->rq_rcv_buf.head[0].iov_base, req);
switch (rpc_decode_header(task, &xdr)) {
@ -2400,7 +2402,6 @@ call_decode(struct rpc_task *task)
task->tk_pid, __func__, task->tk_status);
return;
case -EAGAIN:
out_retry:
task->tk_status = 0;
/* Note: rpc_decode_header() may have freed the RPC slot */
if (task->tk_rqstp == req) {
@ -2449,7 +2450,7 @@ static noinline int
rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
{
struct rpc_clnt *clnt = task->tk_client;
int error = -EACCES;
int error;
__be32 *p;
/* RFC-1014 says that the representation of XDR data must be a
@ -2458,7 +2459,7 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
* undefined results
*/
if (task->tk_rqstp->rq_rcv_buf.len & 3)
goto out_badlen;
goto out_unparsable;
p = xdr_inline_decode(xdr, 3 * sizeof(*p));
if (!p)
@ -2492,10 +2493,12 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
error = -EOPNOTSUPP;
goto out_err;
case rpc_garbage_args:
case rpc_system_err:
trace_rpc__garbage_args(task);
error = -EIO;
break;
default:
trace_rpc__unparsable(task);
goto out_unparsable;
}
out_garbage:
@ -2509,11 +2512,6 @@ out_err:
rpc_exit(task, error);
return error;
out_badlen:
trace_rpc__unparsable(task);
error = -EIO;
goto out_err;
out_unparsable:
trace_rpc__unparsable(task);
error = -EIO;
@ -2524,6 +2522,7 @@ out_verifier:
goto out_garbage;
out_msg_denied:
error = -EACCES;
p = xdr_inline_decode(xdr, sizeof(*p));
if (!p)
goto out_unparsable;
@ -2535,9 +2534,7 @@ out_msg_denied:
error = -EPROTONOSUPPORT;
goto out_err;
default:
trace_rpc__unparsable(task);
error = -EIO;
goto out_err;
goto out_unparsable;
}
p = xdr_inline_decode(xdr, sizeof(*p));
@ -2572,8 +2569,7 @@ out_msg_denied:
task->tk_xprt->servername);
break;
default:
trace_rpc__unparsable(task);
error = -EIO;
goto out_unparsable;
}
goto out_err;
}

2
net/sunrpc/xprt.c
View File

@ -664,7 +664,7 @@ void xprt_disconnect_done(struct rpc_xprt *xprt)
spin_lock_bh(&xprt->transport_lock);
xprt_clear_connected(xprt);
xprt_clear_write_space_locked(xprt);
xprt_wake_pending_tasks(xprt, -EAGAIN);
xprt_wake_pending_tasks(xprt, -ENOTCONN);
spin_unlock_bh(&xprt->transport_lock);
}
EXPORT_SYMBOL_GPL(xprt_disconnect_done);

2
net/sunrpc/xprtsock.c
View File

@ -453,7 +453,7 @@ xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
goto out;
if (ret != want)
goto out;
} else
} else if (offset < seek_init)
offset = seek_init;
ret = -EMSGSIZE;
out: