* [PATCH] netfilter: No increment ctx->level for NFT_GOTO
@ 2020-08-28 16:20 Steve Hill
0 siblings, 0 replies; only message in thread
From: Steve Hill @ 2020-08-28 16:20 UTC (permalink / raw)
To: netfilter-devel
[-- Attachment #1: Type: text/plain, Size: 2148 bytes --]
nft_immediate_validate() and nft_lookup_validate_setelem() treat
NFT_GOTO and NFT_JUMP identically, incrementing pctx->level for both.
This results in a -EMLINK ("Too many links") being unexpectedly returned
for rulesets that use lots of gotos.
This fixes this problem by not incrementing pctx->level when following
gotos.
Fixes: https://bugzilla.netfilter.org/show_bug.cgi?id=1459
Signed-off-by: Steve Hill <steve@opendium.com>
---
diff -urN
linux-4.18.0-193.14.2.el8.x86_64.vanilla/net/netfilter/nft_immediate.c
linux-4.18.0-193.14.2.el8.x86_64.opendium/net/netfilter/nft_immediate.c
---
linux-4.18.0-193.14.2.el8.x86_64.vanilla/net/netfilter/nft_immediate.c
2020-07-19 15:03:44.000000000 +0100
+++
linux-4.18.0-193.14.2.el8.x86_64.opendium/net/netfilter/nft_immediate.c
2020-08-26 15:39:47.004754668 +0100
@@ -113,13 +113,19 @@
switch (data->verdict.code) {
case NFT_JUMP:
- case NFT_GOTO:
pctx->level++;
err = nft_chain_validate(ctx, data->verdict.chain);
if (err < 0)
return err;
pctx->level--;
break;
+ case NFT_GOTO:
+ err = nft_chain_validate(ctx, data->verdict.chain);
+ if (err < 0)
+ return err;
+ break;
default:
break;
}
diff -urN
linux-4.18.0-193.14.2.el8.x86_64.vanilla/net/netfilter/nft_lookup.c
linux-4.18.0-193.14.2.el8.x86_64.opendium/net/netfilter/nft_lookup.c
--- linux-4.18.0-193.14.2.el8.x86_64.vanilla/net/netfilter/nft_lookup.c
2020-07-19 15:03:44.000000000 +0100
+++ linux-4.18.0-193.14.2.el8.x86_64.opendium/net/netfilter/nft_lookup.c
2020-08-26 15:42:35.885223417 +0100
@@ -176,13 +176,19 @@
data = nft_set_ext_data(ext);
switch (data->verdict.code) {
case NFT_JUMP:
- case NFT_GOTO:
pctx->level++;
err = nft_chain_validate(ctx, data->verdict.chain);
if (err < 0)
return err;
pctx->level--;
break;
+ case NFT_GOTO:
+ err = nft_chain_validate(ctx, data->verdict.chain);
+ if (err < 0)
+ return err;
+ break;
default:
break;
}
[-- Attachment #2: steve.vcf --]
[-- Type: text/x-vcard, Size: 259 bytes --]
begin:vcard
fn:Steve Hill
n:Hill;Steve
org:Opendium Limited
adr:1 Brue Close;;Highfield House;Bruton;Somerset;BA10 0HY;England
email;internet:steve@opendium.com
title:Technical Director
x-mozilla-html:FALSE
url:https://www.opendium.com
version:2.1
end:vcard
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2020-08-28 16:58 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-08-28 16:20 [PATCH] netfilter: No increment ctx->level for NFT_GOTO Steve Hill
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).