rule: json: fix returned string length

It was returning one byte more than the real string length.

Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/src/rule.c b/src/rule.c
index b4ce8f1c1966ddb51ab34d8b55d320004864b37a..5fd8814f12dbe156b3f98241755ff48d844b594c 100644 (file)
--- a/src/rule.c
+++ b/src/rule.c
@@ -745,7 +745,9 @@ static int nft_rule_snprintf_json(char *buf, size_t size, struct nft_rule *r,
                SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
 
        }
-       ret = snprintf(buf+offset-1, len, "]}}");
+       /* Remove comma from last element */
+       offset--;
+       ret = snprintf(buf+offset, len, "]}}");
        SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
 
        return offset;