diff options
Diffstat (limited to 'iptables/nft.c')
| -rw-r--r-- | iptables/nft.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/iptables/nft.c b/iptables/nft.c index e7cb827b..76759251 100644 --- a/iptables/nft.c +++ b/iptables/nft.c @@ -1041,15 +1041,21 @@ enum udata_type { int add_comment(struct nftnl_rule *r, const char *comment) { struct nftnl_udata_buf *udata; - char comm[254]; + uint32_t len; + + if (nftnl_rule_get_data(r, NFTNL_RULE_USERDATA, &len)) + return -EALREADY; udata = nftnl_udata_buf_alloc(NFT_USERDATA_MAXLEN); if (!udata) return -ENOMEM; - snprintf(comm, sizeof(comm), "%s", comment); - if (!nftnl_udata_put_strz(udata, UDATA_TYPE_COMMENT, comm)) + if (strnlen(comment, 255) == 255) + return -ENOSPC; + + if (!nftnl_udata_put_strz(udata, UDATA_TYPE_COMMENT, comment)) return -ENOMEM; + nftnl_rule_set_data(r, NFTNL_RULE_USERDATA, nftnl_udata_buf_data(udata), nftnl_udata_buf_len(udata)); |