netdev - [PATCH 3/3 v2] 9p: Use P9

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Date:   Thu, 17 Nov 2022 17:11:59 +0800
From:   GUO Zihua <guozihua@...wei.com>
To:     <ericvh@...il.com>, <lucho@...kov.net>, <asmadeus@...ewreck.org>,
        <linux_oss@...debyte.com>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <v9fs-developer@...ts.sourceforge.net>,
        <netdev@...r.kernel.org>
Subject: [PATCH 3/3 v2] 9p: Use P9_HDRSZ for header size

The m->rc.offset here actually represents the header size of a p9
message. So instead we use P9_HDRSZ directly. At the mean time, update
all header sizes as well.

Fixes: 3da2e34b64cd ("9p: Fix write overflow in p9_read_work")
Signed-off-by: GUO Zihua <guozihua@...wei.com>
---
 net/9p/trans_fd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 4ba602438550..89a51fcc831d 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -120,7 +120,7 @@ struct p9_conn {
 	struct list_head unsent_req_list;
 	struct p9_req_t *rreq;
 	struct p9_req_t *wreq;
-	char tmp_buf[7];
+	char tmp_buf[P9_HDRSZ];
 	struct p9_fcall rc;
 	int wpos;
 	int wsize;
@@ -291,7 +291,7 @@ static void p9_read_work(struct work_struct *work)
 	if (!m->rc.sdata) {
 		m->rc.sdata = m->tmp_buf;
 		m->rc.offset = 0;
-		m->rc.capacity = 7; /* start by reading header */
+		m->rc.capacity = P9_HDRSZ; /* start by reading header */
 	}
 
 	clear_bit(Rpending, &m->wsched);
@@ -314,7 +314,7 @@ static void p9_read_work(struct work_struct *work)
 		p9_debug(P9_DEBUG_TRANS, "got new header\n");
 
 		/* Header size */
-		m->rc.size = 7;
+		m->rc.size = P9_HDRSZ;
 		err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0);
 		if (err) {
 			p9_debug(P9_DEBUG_ERROR,
@@ -334,7 +334,7 @@ static void p9_read_work(struct work_struct *work)
 			goto error;
 		}
 
-		if (m->rc.size > m->rreq->rc.capacity - m->rc.offset) {
+		if (m->rc.size > m->rreq->rc.capacity - P9_HDRSZ) {
 			p9_debug(P9_DEBUG_ERROR,
 				 "requested packet size too big: %d for tag %d with capacity %zd\n",
 				 m->rc.size, m->rc.tag, m->rreq->rc.capacity);
-- 
2.17.1