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From: Trond Myklebust <trondmy@gmail.com>
To: linux-nfs@vger.kernel.org
Subject: [PATCH 4/6] SUNRPC: rpc_decode_header() must always return a non-zero value on error
Date: Fri, 15 Mar 2019 13:51:39 -0400	[thread overview]
Message-ID: <20190315175141.68792-4-trond.myklebust@hammerspace.com> (raw)
In-Reply-To: <20190315175141.68792-3-trond.myklebust@hammerspace.com>

Ensure that when the "garbage args" case falls through, we do set
an error of EIO.

Fixes: a0584ee9aed8 ("SUNRPC: Use struct xdr_stream when decoding...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 net/sunrpc/clnt.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 310873895578..1f47801e0002 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -2454,7 +2454,7 @@ 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
@@ -2463,7 +2463,7 @@ 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)
@@ -2498,9 +2498,10 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
 		goto out_err;
 	case rpc_garbage_args:
 		trace_rpc__garbage_args(task);
+		error = -EIO;
 		break;
 	default:
-		trace_rpc__unparsable(task);
+		goto out_unparsable;
 	}
 
 out_garbage:
@@ -2514,11 +2515,6 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
 	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;
@@ -2529,6 +2525,7 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
 	goto out_garbage;
 
 out_msg_denied:
+	error = -EACCES;
 	p = xdr_inline_decode(xdr, sizeof(*p));
 	if (!p)
 		goto out_unparsable;
@@ -2540,9 +2537,7 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
 		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));
@@ -2577,8 +2572,7 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
 			task->tk_xprt->servername);
 		break;
 	default:
-		trace_rpc__unparsable(task);
-		error = -EIO;
+		goto out_unparsable;
 	}
 	goto out_err;
 }
-- 
2.20.1


  reply	other threads:[~2019-03-15 17:52 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-15 17:51 [PATCH 1/6] SUNRPC: Fix a client regression when handling oversized replies Trond Myklebust
2019-03-15 17:51 ` [PATCH 2/6] SUNRPC: Fix the minimal size for reply buffer allocation Trond Myklebust
2019-03-15 17:51   ` [PATCH 3/6] SUNRPC: Use the ENOTCONN error on socket disconnect Trond Myklebust
2019-03-15 17:51     ` Trond Myklebust [this message]
2019-03-15 17:51       ` [PATCH 5/6] SUNRPC: Handle the SYSTEM_ERR rpc error Trond Myklebust
2019-03-15 17:51         ` [PATCH 6/6] SUNRPC: Remove redundant check for the reply length in call_decode() Trond Myklebust

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