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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49d26be64a5sm62886595e9.6.2026.09.10.03.54.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2026 03:54:39 -0700 (PDT) Date: Thu, 10 Sep 2026 11:54:38 +0100 From: David Laight To: Lalit Shankar Chowdhury Cc: David Ahern , Ido Schimmel , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Steffen Klassert , Herbert Xu , netdev@vger.kernel.org (open list:NETWORKING [IPv4/IPv6]), linux-kernel@vger.kernel.org (open list) Subject: Re: [PATCH] ipv6: replace sprintf() with no format specifiers with strscpy() Message-ID: <20260910115438.1c89b372@pumpkin> In-Reply-To: <20260909210552.51828-1-lalitshankarch@gmail.com> References: <20260909210552.51828-1-lalitshankarch@gmail.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 9 Sep 2026 21:05:52 +0000 Lalit Shankar Chowdhury wrote: > Multiple instances of sprintf() have no format specifiers. Replace > them with strscpy(). > > Signed-off-by: Lalit Shankar Chowdhury > --- > net/ipv6/ip6_tunnel.c | 2 +- > net/ipv6/ip6_vti.c | 2 +- > net/ipv6/ip6mr.c | 2 +- > 3 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c > index d5ff50a2ac01..ef3a6d931c9e 100644 > --- a/net/ipv6/ip6_tunnel.c > +++ b/net/ipv6/ip6_tunnel.c > @@ -294,7 +294,7 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) > goto failed; > strscpy(name, p->name, IFNAMSIZ); > } else { > - sprintf(name, "ip6tnl%%d"); > + strscpy(name, "ip6tnl%d", IFNAMSIZ); > } > err = -ENOMEM; > dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, That code is silly, there is no need for the copies at all. Something like: if (p->name[0] && !dev_valid_name[p->name]) return ERR_PTR(-E2BIG); dev = alloc_netdev(sizeof(*t), p->name[0] ? p->name : "op6tnl%d", NET_NAME_UNKNOWN, ip6_tnl_dev_setup); if (!dev) return ERR_PTR(-ENOMEM); David > diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c > index ab94b3a4ba9c..182a7949d830 100644 > --- a/net/ipv6/ip6_vti.c > +++ b/net/ipv6/ip6_vti.c > @@ -210,7 +210,7 @@ static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p > goto failed; > strscpy(name, p->name, IFNAMSIZ); > } else { > - sprintf(name, "ip6_vti%%d"); > + strscpy(name, "ip6_vti%d", IFNAMSIZ); > } > > dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup); > diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c > index 3f2ed9b77deb..20ac8cb87468 100644 > --- a/net/ipv6/ip6mr.c > +++ b/net/ipv6/ip6mr.c > @@ -692,7 +692,7 @@ static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt) > char name[IFNAMSIZ]; > > if (mrt->id == RT6_TABLE_DFLT) > - sprintf(name, "pim6reg"); > + strscpy(name, "pim6reg", IFNAMSIZ); > else > sprintf(name, "pim6reg%u", mrt->id); >