linux-kernel - [PATCH v2] net/9p/trans_virtio.c: add null terminal for mount tag

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Message-ID: <5B6262F4.9080601@huawei.com>
Date:   Thu, 2 Aug 2018 09:48:36 +0800
From:   piaojun <piaojun@...wei.com>
To:     Dominique Martinet <asmadeus@...ewreck.org>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "Eric Van Hensbergen" <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        "Latchesar Ionkov" <lucho@...kov.net>, Greg Kurz <groug@...d.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        <v9fs-developer@...ts.sourceforge.net>
Subject: [PATCH v2] net/9p/trans_virtio.c: add null terminal for mount tag

chan->tag is Non-null terminated which will result in printing messy code
when debugging code. So we should add '\0' for tag to make the code more
convenient and robust. In addition, I drop char->tag_len to simplify the
code.

Signed-off-by: Jun Piao <piaojun@...wei.com>
---
 net/9p/trans_virtio.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index d422bfc..0fe9c37 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -89,10 +89,8 @@ struct virtio_chan {
 	unsigned long p9_max_pages;
 	/* Scatterlist: can be too big for stack. */
 	struct scatterlist sg[VIRTQUEUE_NUM];
-
-	int tag_len;
 	/*
-	 * tag name to identify a mount Non-null terminated
+	 * tag name to identify a mount null terminated
 	 */
 	char *tag;

@@ -529,10 +527,9 @@ static ssize_t p9_mount_tag_show(struct device *dev,
 	vdev = dev_to_virtio(dev);
 	chan = vdev->priv;

-	memcpy(buf, chan->tag, chan->tag_len);
-	buf[chan->tag_len] = 0;
+	memcpy(buf, chan->tag, strlen(chan->tag) + 1);

-	return chan->tag_len + 1;
+	return strlen(chan->tag) + 1;
 }

 static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);
@@ -585,7 +582,7 @@ static int p9_virtio_probe(struct virtio_device *vdev)
 		err = -EINVAL;
 		goto out_free_vq;
 	}
-	tag = kmalloc(tag_len, GFP_KERNEL);
+	tag = kzalloc(tag_len + 1, GFP_KERNEL);
 	if (!tag) {
 		err = -ENOMEM;
 		goto out_free_vq;
@@ -594,7 +591,6 @@ static int p9_virtio_probe(struct virtio_device *vdev)
 	virtio_cread_bytes(vdev, offsetof(struct virtio_9p_config, tag),
 			   tag, tag_len);
 	chan->tag = tag;
-	chan->tag_len = tag_len;
 	err = sysfs_create_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr);
 	if (err) {
 		goto out_free_tag;
@@ -654,8 +650,7 @@ static int p9_virtio_probe(struct virtio_device *vdev)

 	mutex_lock(&virtio_9p_lock);
 	list_for_each_entry(chan, &virtio_chan_list, chan_list) {
-		if (!strncmp(devname, chan->tag, chan->tag_len) &&
-		    strlen(devname) == chan->tag_len) {
+		if (!strncmp(devname, chan->tag, strlen(chan->tag) + 1)) {
 			if (!chan->inuse) {
 				chan->inuse = true;
 				found = 1;
--