[nf-next PATCH v2 1/2] netfilter: xt_recent: Reduce size of struct recent_entry::nstamps

[Phil Sutter <phil@nwl.cc>]

There is no point in this change besides presenting its possibility
separate from a follow-up patch extending the size of both 'index' and
'nstamps' fields.

The value of 'nstamps' is initialized to 1 in recent_entry_init() and
adjusted in recent_entry_update() to match that of 'index' if it becomes
larger after being incremented. Since 'index' is of type u8, it will at
max become 255 (and wrap to 0 afterwards). Therefore, 'nstamps' will
also never exceed the value 255.

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 net/netfilter/xt_recent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index ef93e0d3bee0..60259280b2d5 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -70,7 +70,7 @@ struct recent_entry {
 	u_int16_t		family;
 	u_int8_t		ttl;
 	u_int8_t		index;
-	u_int16_t		nstamps;
+	u_int8_t		nstamps;
 	unsigned long		stamps[];
 };
 
-- 
2.43.0