diff mbox series

[v2,5/7] netfilter: nft_osf: refactor deprecated strncpy

Message ID 20230809-net-netfilter-v2-5-5847d707ec0a@google.com
State Accepted, archived
Headers show
Series netfilter: refactor deprecated strncpy | expand

Commit Message

Justin Stitt Aug. 9, 2023, 1:06 a.m. UTC 
Use `strscpy_pad` over `strncpy` for NUL-terminated strings.

We can also drop the + 1 from `NFT_OSF_MAXGENRELEN + 1` since `strscpy`
will guarantee NUL-termination.

Signed-off-by: Justin Stitt <justinstitt@google.com>

---
Note: Should this usage @8556bceb9c409 also be changed to `strscpy_pad`
or is zero-padding not required here?
---
 net/netfilter/nft_osf.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Florian Westphal Aug. 9, 2023, 8:21 p.m. UTC | #1 
Justin Stitt <justinstitt@google.com> wrote:
 ---
> Note: Should this usage @8556bceb9c409 also be changed to `strscpy_pad`
> or is zero-padding not required here?

That commit converted strlcpy which doesn't do any zero-padding,
I don't see anything wrong with that change.
diff mbox series

Patch

diff --git a/net/netfilter/nft_osf.c b/net/netfilter/nft_osf.c
index 70820c66b591..7f61506e5b44 100644
--- a/net/netfilter/nft_osf.c
+++ b/net/netfilter/nft_osf.c
@@ -23,7 +23,7 @@  static void nft_osf_eval(const struct nft_expr *expr, struct nft_regs *regs,
 	struct nft_osf *priv = nft_expr_priv(expr);
 	u32 *dest = &regs->data[priv->dreg];
 	struct sk_buff *skb = pkt->skb;
-	char os_match[NFT_OSF_MAXGENRELEN + 1];
+	char os_match[NFT_OSF_MAXGENRELEN];
 	const struct tcphdr *tcp;
 	struct nf_osf_data data;
 	struct tcphdr _tcph;
@@ -45,7 +45,7 @@  static void nft_osf_eval(const struct nft_expr *expr, struct nft_regs *regs,
 	}
 
 	if (!nf_osf_find(skb, nf_osf_fingers, priv->ttl, &data)) {
-		strncpy((char *)dest, "unknown", NFT_OSF_MAXGENRELEN);
+		strscpy_pad((char *)dest, "unknown", NFT_OSF_MAXGENRELEN);
 	} else {
 		if (priv->flags & NFT_OSF_F_VERSION)
 			snprintf(os_match, NFT_OSF_MAXGENRELEN, "%s:%s",
@@ -53,7 +53,7 @@  static void nft_osf_eval(const struct nft_expr *expr, struct nft_regs *regs,
 		else
 			strscpy(os_match, data.genre, NFT_OSF_MAXGENRELEN);
 
-		strncpy((char *)dest, os_match, NFT_OSF_MAXGENRELEN);
+		strscpy_pad((char *)dest, os_match, NFT_OSF_MAXGENRELEN);
 	}
 }