netfilter: nfnetlink_acct: dump unmodified nfacct flags

NFNL_MSG_ACCT_GET_CTRZERO modifies dumped flags, in this case
client see unmodified (uncleared) counter value and cleared
overquota state - end user doesn't know anything about overquota state,
unless end user subscribed on overquota report.

Signed-off-by: Alexey Perevalov <a.perevalov@samsung.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/netfilter/nfnetlink_acct.c b/net/netfilter/nfnetlink_acct.c
index 2baa125c2e8d..11d863c8b11f 100644
--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -129,6 +129,7 @@ nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
         struct nfgenmsg *nfmsg;
         unsigned int flags = portid ? NLM_F_MULTI : 0;
         u64 pkts, bytes;
+        u32 old_flags;
 
         event |= NFNL_SUBSYS_ACCT << 8;
         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
@@ -143,6 +144,7 @@ nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
         if (nla_put_string(skb, NFACCT_NAME, acct->name))
                 goto nla_put_failure;
 
+        old_flags = acct->flags;
         if (type == NFNL_MSG_ACCT_GET_CTRZERO) {
                 pkts = atomic64_xchg(&acct->pkts, 0);
                 bytes = atomic64_xchg(&acct->bytes, 0);
@@ -160,7 +162,7 @@ nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
         if (acct->flags & NFACCT_F_QUOTA) {
                 u64 *quota = (u64 *)acct->data;
 
-                if (nla_put_be32(skb, NFACCT_FLAGS, htonl(acct->flags)) ||
+                if (nla_put_be32(skb, NFACCT_FLAGS, htonl(old_flags)) ||
                     nla_put_be64(skb, NFACCT_QUOTA, cpu_to_be64(*quota)))
                         goto nla_put_failure;
         }