linux-kernel - [PATCH 1/3] lightnvm: convert sprintf into snprintf

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Date:   Mon, 10 Apr 2017 20:51:36 +0200
From:   "Javier González" <jg@...htnvm.io>
To:     mb@...htnvm.io
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Javier González <javier@...xlabs.com>
Subject: [PATCH 1/3] lightnvm: convert sprintf into snprintf

Convert sprintf calls to snprintf in order to make possible buffer
overflow more obvious.

Signed-off-by: Javier González <javier@...xlabs.com>
---
 drivers/lightnvm/core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index c3340ef..bdbb333 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -272,7 +272,8 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
 		goto err_disk;
 	blk_queue_make_request(tqueue, tt->make_rq);
 
-	sprintf(tdisk->disk_name, "%s", create->tgtname);
+	snprintf(tdisk->disk_name, sizeof(tdisk->disk_name), "%s",
+							create->tgtname);
 	tdisk->flags = GENHD_FL_EXT_DEVT;
 	tdisk->major = 0;
 	tdisk->first_minor = 0;
@@ -1195,13 +1196,13 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
 	list_for_each_entry(dev, &nvm_devices, devices) {
 		struct nvm_ioctl_device_info *info = &devices->info[i];
 
-		sprintf(info->devname, "%s", dev->name);
+		snprintf(info->devname, sizeof(info->devname), "%s", dev->name);
 
 		/* kept for compatibility */
 		info->bmversion[0] = 1;
 		info->bmversion[1] = 0;
 		info->bmversion[2] = 0;
-		sprintf(info->bmname, "%s", "gennvm");
+		snprintf(info->bmname, sizeof(info->bmname), "%s", "gennvm");
 		i++;
 
 		if (i > 31) {
-- 
2.7.4