From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 37C7344AB62; Tue, 21 Jul 2026 21:51:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784670686; cv=none; b=tDBQjkbGGPvQiP1DjiAQ6DnDEUrMXKsdo72UzqP8B/sAnhrvgFFWivgm4GOQfTom+9lDq2w0PtlFqvX2TWW6L8nreAwRhFAs5FXP8oVYlkM0WBqXZOtP0OS9HOjeDHTaLiKvgxbT5NpN0du547U2p3y0fPYNQQhV3ctL7cIhgnk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784670686; c=relaxed/simple; bh=9bYdV4muKUFfMdgV1Z+fv5FdxVB4y5N39qEBk93wJ6c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ie8fktfg4YHU5u5Hrr5kkYCLqHqYClhWXUVoaZFwFIC24LkMHIHUcFtGqa510GaaRxvj76ckBrM7LDygSfTRlaIS5+dA30CfK5AF26tAjvRs28ohHhMfXmAOkonz6ffTf3IFSCAqleykQNwsXG5D8AsiXlYUQoynam/L7Nq3nGI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jhtUIqEY; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="jhtUIqEY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E0981F00A3A; Tue, 21 Jul 2026 21:51:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784670685; bh=DnPk2Tjjsp2+Lf0SRK6il/mT8I0cIBAK1g1i2cVfgEg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jhtUIqEY1GlNOIthd5pVacjWb94zImXC8xhrUJrsgnE/ftwa1l6qV8amycTQ79Xxf mDqMWae4pCuLmqg7dbg3tlIYdIzstyN8kUwd2SixenfJxiLkciDhsz6oUDsTNDdVYy lsXIbkOZqPRhrevHoOotfLWFtqQ/QSAI2Tnnc7MU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Westphal , Sasha Levin Subject: [PATCH 6.1 0983/1067] netfilter: ebtables: zero chainstack array Date: Tue, 21 Jul 2026 17:26:24 +0200 Message-ID: <20260721152446.544536878@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152424.521567757@linuxfoundation.org> References: <20260721152424.521567757@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Florian Westphal [ Upstream commit cbfe53599eebffd188938ab6774cc41794f6f9d5 ] sashiko reports: looking at ebtables table translation, could a sparse cpu_possible_mask lead to an uninitialized pointer free? If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible, but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at CPU 2, the cleanup loop will blindly decrement and call vfree() on newinfo->chainstack[1]. Not a real-world bug, such allocation isn't expected to fail in the first place. Cc: stable@vger.kernel.org Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/bridge/netfilter/ebtables.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -923,8 +923,7 @@ static int translate_table(struct net *n * if an error occurs */ newinfo->chainstack = - vmalloc_array(nr_cpu_ids, - sizeof(*(newinfo->chainstack))); + vcalloc(nr_cpu_ids, sizeof(*(newinfo->chainstack))); if (!newinfo->chainstack) return -ENOMEM; for_each_possible_cpu(i) {