[PATCH net-next v2 1/2] keys, dns: drop unused upayload->data NUL terminator

Thorsten Blum
2026-04-09T22:57:55Z

In dns_resolver_preparse(), do not NUL-terminate ->data and allocate one
byte less. The NUL terminator is never used and only ->datalen bytes are
accessed.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
No changes in patch 1/2.
---
net/dns_resolver/dns_key.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c
index c3c8c3240ef9..451247864a63 100644
--- a/net/dns_resolver/dns_key.c
+++ b/net/dns_resolver/dns_key.c
@@ -203,7 +203,7 @@ dns_resolver_preparse(struct key_preparsed_payload *prep)
kdebug("store result");
prep->quotalen = result_len;

- upayload = kmalloc_flex(*upayload, data, result_len + 1);
+ upayload = kmalloc_flex(*upayload, data, result_len);
if (!upayload) {
kleave(" = -ENOMEM");
return -ENOMEM;
@@ -211,7 +211,6 @@ dns_resolver_preparse(struct key_preparsed_payload *prep)

upayload->datalen = result_len;
memcpy(upayload->data, data, result_len);
- upayload->data[result_len] = '\0';

prep->payload.data[dns_key_data] = upayload;
kleave(" = 0");