From: Thorsten Blum <thorsten.blum@linux.dev>
To: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
Amir Goldstein <amir73il@gmail.com>, Tim Bird <tim.bird@sony.com>,
Christian Brauner <brauner@kernel.org>
Cc: Thorsten Blum <thorsten.blum@linux.dev>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH net-next] net/dns_resolver: consolidate namelen checks in dns_query
Date: Mon, 25 May 2026 11:54:01 +0200 [thread overview]
Message-ID: <20260525095400.821912-3-thorsten.blum@linux.dev> (raw)
Consolidate the namelen checks and return -EINVAL early if needed. Drop
the namelen == 0 check since it is covered by namelen < 3.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
net/dns_resolver/dns_query.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index e1c09d7b8200..c250d82cad96 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -73,7 +73,7 @@ int dns_query(struct net *net,
kenter("%s,%*.*s,%zu,%s",
type, (int)namelen, (int)namelen, name, namelen, options);
- if (!name || namelen == 0)
+ if (!name || namelen < 3 || namelen > 255)
return -EINVAL;
/* construct the query key description as "[<type>:]<name>" */
@@ -86,8 +86,6 @@ int dns_query(struct net *net,
desclen += typelen + 1;
}
- if (namelen < 3 || namelen > 255)
- return -EINVAL;
desclen += namelen + 1;
desc = kmalloc(desclen, GFP_KERNEL);
reply other threads:[~2026-05-25 9:55 UTC|newest]
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