[PATCH net-next] ipv6: sit: Replace deprecated strcpy with strscpy

[Thorsten Blum <thorsten.blum@linux.dev>]

strcpy() has been deprecated [1] because it performs no bounds checking
on the destination buffer, which can lead to buffer overflows. Replace
it with the safer strscpy().  Use the two-argument version of strscpy()
to copy 'parms->name' in ipip6_tunnel_locate().

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy [1]
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
 net/ipv6/sit.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 439c8a1c6625..52f105315e1e 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -21,6 +21,7 @@
 #include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/sockios.h>
+#include <linux/string.h>
 #include <linux/net.h>
 #include <linux/in6.h>
 #include <linux/netdevice.h>
@@ -256,9 +257,9 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
 	if (parms->name[0]) {
 		if (!dev_valid_name(parms->name))
 			goto failed;
-		strscpy(name, parms->name, IFNAMSIZ);
+		strscpy(name, parms->name);
 	} else {
-		strcpy(name, "sit%d");
+		strscpy(name, "sit%d");
 	}
 	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 			   ipip6_tunnel_setup);
@@ -275,7 +276,7 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
 		goto failed_free;
 
 	if (!parms->name[0])
-		strcpy(parms->name, dev->name);
+		strscpy(parms->name, dev->name);
 
 	return nt;
 
@@ -1442,7 +1443,7 @@ static int ipip6_tunnel_init(struct net_device *dev)
 	int err;
 
 	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);
+	strscpy(tunnel->parms.name, dev->name);
 
 	ipip6_tunnel_bind_dev(dev);
 
@@ -1863,7 +1864,7 @@ static int __net_init sit_init_net(struct net *net)
 	ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
 	ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
 
-	strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
+	strscpy(t->parms.name, sitn->fb_tunnel_dev->name);
 	return 0;
 
 err_reg_dev:
-- 
Thorsten Blum <thorsten.blum@linux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4