linux-kernel - [PATCH 1/2] net/9p: Return error if we fail to encode protocol data

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Date:	Mon, 18 Oct 2010 20:10:52 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	v9fs-developer@...ts.sourceforge.net
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH 1/2] net/9p: Return error if we fail to encode protocol data

We need to return error in case we fail to encode data in protocl buffer.
This patch also return error in case of a failed copy_from_user.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 net/9p/client.c   |    2 ++
 net/9p/protocol.c |    5 ++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index b2b066a..e141e46 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -579,6 +579,8 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 	va_start(ap, fmt);
 	err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 	va_end(ap);
+	if (err)
+		goto reterr;
 	p9pdu_finalize(req->tc);
 
 	err = c->trans_mod->request(c, req);
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 3acd3af..45c15f4 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -122,9 +122,8 @@ static size_t
 pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
 {
 	size_t len = MIN(pdu->capacity - pdu->size, size);
-	int err = copy_from_user(&pdu->sdata[pdu->size], udata, len);
-	if (err)
-		printk(KERN_WARNING "pdu_write_u returning: %d\n", err);
+	if (copy_from_user(&pdu->sdata[pdu->size], udata, len))
+		len = 0;
 
 	pdu->size += len;
 	return size - len;
-- 
1.7.1

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