From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1381AC54EE9 for ; Tue, 20 Sep 2022 12:20:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229783AbiITMUb (ORCPT ); Tue, 20 Sep 2022 08:20:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229530AbiITMUa (ORCPT ); Tue, 20 Sep 2022 08:20:30 -0400 Received: from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc [IPv6:2a0a:51c0:0:12e:520::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ADCA57332C for ; Tue, 20 Sep 2022 05:20:28 -0700 (PDT) Received: from fw by Chamillionaire.breakpoint.cc with local (Exim 4.92) (envelope-from ) id 1oacEj-0007zH-PR; Tue, 20 Sep 2022 14:20:25 +0200 From: Florian Westphal To: Cc: syzkaller-bugs@googlegroups.com, Florian Westphal , syzbot+a24c5252f3e3ab733464@syzkaller.appspotmail.com Subject: [PATCH nf] netfilter: ebtables: fix memory leak when blob is malformed Date: Tue, 20 Sep 2022 14:20:17 +0200 Message-Id: <20220920122017.2600-1-fw@strlen.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <000000000000b010bd05e9100e11@google.com> References: <000000000000b010bd05e9100e11@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org The bug fix was incomplete, it "replaced" crash with a memory leak. The old code had an assignment to "ret" embedded into the conditional, restore this. Fixes: 7997eff82828 ("netfilter: ebtables: reject blobs that don't provide all entry points") Reported-and-tested-by: syzbot+a24c5252f3e3ab733464@syzkaller.appspotmail.com Signed-off-by: Florian Westphal --- net/bridge/netfilter/ebtables.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index 8f6639e095a0..c4af063c0c8f 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -1040,8 +1040,10 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl, goto free_iterate; } - if (repl->valid_hooks != t->valid_hooks) + if (repl->valid_hooks != t->valid_hooks) { + ret = -EINVAL; goto free_unlock; + } if (repl->num_counters && repl->num_counters != t->private->nentries) { ret = -EINVAL; -- 2.18.1