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 9F082441616; Tue, 21 Jul 2026 22:29:09 +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=1784672950; cv=none; b=Rz1rKfwAZspeYb4fY7VBi/QxMoWo3W7GPU2V9zM3F0l6nYRu1PCftB+VdEAqlmpV8ul3SLWQeMcU2HYBJYSUtDVmQ9grdWRg40fQPMBTNuefxEdlS0+UgonZJRDEx1czuqakpa1fNwu/M49ieNReS0mKOmsnR0G+Fd9ZGrMJj0I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672950; c=relaxed/simple; bh=1FuH1NI4BPwkwhRqYMgGNkAcesmBpBYXCfxSjIBu8og=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=guEDu74J+ihpl/zgWWhMG7BTTK1tnw7B9pKeupWHwq5lt7IBPe1QNrJo4YDCY7kpgusGzQ2wa2TZsTkYHRaNFfga91RJV01xbpafheBnln6xr9eIUATRihY7cMPTHaxNdY9sDlvKqkmWTJq/QLuc+L6jnG9cW3XRfYLQAhZ3Klc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OPiU/Fru; 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="OPiU/Fru" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07E951F000E9; Tue, 21 Jul 2026 22:29:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672949; bh=xprAw9GrmrzEroqBSiciL7WtQlyru4oCvrgDMizQPuc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OPiU/FruXxlyoZKR0kbR0bM62VyF53S/hGsoY2NRDqUwKi8YNlNgkfrkMUxq0KcGr lmAsmgU7JNDdOsF73RJ7Yd8Muzdd368k1FEKiUEGvf40ERW71pJfBAPz8kzhWkerRs gwXjVwIKF2uamjvkPx5NZ33VcXIulQzhkeomu11c= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Westphal , Sasha Levin Subject: [PATCH 5.15 775/843] netfilter: ebtables: zero chainstack array Date: Tue, 21 Jul 2026 17:26:50 +0200 Message-ID: <20260721152423.489006301@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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 5.15-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) {