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[PATCH 3.16 305/305] Revert "netfilter: ensure number of counters is >0 in do_replace()"

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  [PATCH 3.16 305/305] Revert "netfilter: ensure number of counters  is >0 in do_replace()" Ben Hutchings <ben@decadent.org.uk> - 2016-08-14 20:20 +0200

#1462279 — [PATCH 3.16 305/305] Revert "netfilter: ensure number of counters is >0 in do_replace()"

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bernhard Thaler <bernhard.thaler@wvnet.at>

commit d26e2c9ffa385dd1b646f43c1397ba12af9ed431 upstream.

This partially reverts commit 1086bbe97a07 ("netfilter: ensure number of
counters is >0 in do_replace()") in net/bridge/netfilter/ebtables.c.

Setting rules with ebtables does not work any more with 1086bbe97a07 place.

There is an error message and no rules set in the end.

e.g.

~# ebtables -t nat -A POSTROUTING --src 12:34:56:78:9a:bc -j DROP
Unable to update the kernel. Two possible causes:
1. Multiple ebtables programs were executing simultaneously. The ebtables
   userspace tool doesn't by default support multiple ebtables programs
running

Reverting the ebtables part of 1086bbe97a07 makes this work again.

Signed-off-by: Bernhard Thaler <bernhard.thaler@wvnet.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 net/bridge/netfilter/ebtables.c | 4 ----
 1 file changed, 4 deletions(-)

--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1105,8 +1105,6 @@ static int do_replace(struct net *net, c
 		return -ENOMEM;
 	if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
 		return -ENOMEM;
-	if (tmp.num_counters == 0)
-		return -EINVAL;
 
 	tmp.name[sizeof(tmp.name) - 1] = 0;
 
@@ -2152,8 +2150,6 @@ static int compat_copy_ebt_replace_from_
 		return -ENOMEM;
 	if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
 		return -ENOMEM;
-	if (tmp.num_counters == 0)
-		return -EINVAL;
 
 	memcpy(repl, &tmp, offsetof(struct ebt_replace, hook_entry));
 

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