From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86B3C37F01B; Wed, 8 Apr 2026 18:29:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775672969; cv=none; b=Wno/C2rxIyQ53IPO8Vh2GHyvGkvY7VpVDU+5+C5ZNbv7DrpxQH2+vyj/0cTm7k8TSkr/F4zMIn+dw/B2XyXUiciQOjD8nSPbET3zqrbYx1AFg341FzJFqR+MbhsdgR9ay9GqEPG1r8P/R04mxm50bH3ocfmVDKQ3VxjvfGoJzTY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775672969; c=relaxed/simple; bh=mBAo5M/4+N2Xs+tPWrIuyMVk5AYD1gLdPTsK4d0pCWI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FwnpOeqpUTy9BxagXd6Sqbd4W40JOWlDfp0POj3AW8vJFFe4b0eWlyfsDq2v+96ptHIwG/QfTEasmaPgIPvFaMgQPNGWVinmOAr3/ptOdH7lIh3vuOwlXx/yf+9j3zqPamSvP1dc+CuEs0dGx1VchNBu7pI/N0rxowhz59U2LDY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wmT5I7p4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wmT5I7p4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 11018C19421; Wed, 8 Apr 2026 18:29:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1775672969; bh=mBAo5M/4+N2Xs+tPWrIuyMVk5AYD1gLdPTsK4d0pCWI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wmT5I7p4pL7RXGUul4u1yQ9my3rsLP7gg0mqoBPwNdnRUm9uU2aixjx550RkT6aob G4dJLTBUOfhL/j3JpnsHYyBro2ubMOXggN79AfPPGOWzbXK5+HQXP7BqvOoCOIrqd3 3Vg6c4gV7ymCNWUn2PHwJAwVIVb1BcC0mNGrmjwk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yochai Eisenrich , Jamal Hadi Salim , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.18 051/277] net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak Date: Wed, 8 Apr 2026 20:00:36 +0200 Message-ID: <20260408175935.763835439@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260408175933.836769063@linuxfoundation.org> References: <20260408175933.836769063@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yochai Eisenrich [ Upstream commit e6e3eb5ee89ac4c163d46429391c889a1bb5e404 ] When building netlink messages, tc_chain_fill_node() never initializes the tcm_info field of struct tcmsg. Since the allocation is not zeroed, kernel heap memory is leaked to userspace through this 4-byte field. The fix simply zeroes tcm_info alongside the other fields that are already initialized. Fixes: 32a4f5ecd738 ("net: sched: introduce chain object to uapi") Signed-off-by: Yochai Eisenrich Acked-by: Jamal Hadi Salim Link: https://patch.msgid.link/20260328211436.1010152-1-echelonh@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sched/cls_api.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index bac9cd71ff8e9..b03dc4fe20e52 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -2969,6 +2969,7 @@ static int tc_chain_fill_node(const struct tcf_proto_ops *tmplt_ops, tcm->tcm__pad1 = 0; tcm->tcm__pad2 = 0; tcm->tcm_handle = 0; + tcm->tcm_info = 0; if (block->q) { tcm->tcm_ifindex = qdisc_dev(block->q)->ifindex; tcm->tcm_parent = block->q->handle; -- 2.53.0