From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3641323-1519411362-2-13796905592169927056 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.001, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519411362; b=mQ11/8/3YWfCJB7OOE0wdFpSfxXSJZ2RHQa37mrWsDpI/bF gdIdquWwrpLv07VFQN7bstyK43JndLgpCr1qMcbM37LC5HAGSJyTIiAq4tclJhIK Jy5DsA+UmpKbagpeL+BzeY788kxl7lD+J483gCRF98fMpSMKk2Ym/m5XQ1ggAB5Q EUU8O4c31g5/6ZJygFoOEnnaZySFn0Mqo0ssr1av5wlP/TM3P37oRsRLSYvBVSQd /+QEtpGBTOycjyaJqyy3+rwxxyhkqPUNbMVFxzC22wqmycCPEYMsLL6rmszxspdI 1HVAIKkmzMv52MVrm8xmSQM6u0HLVxi1+4gPqRQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=arctest; t=1519411362; bh=l/6tm4U/mfV/GwdY9onGqcSLfI DJcrEhr4GKSkqedvQ=; b=q8M7vOEwUgmYZoaDzM0MZwejWeeKoBisIIhpRJ3kpR rzYXg4CMnekKP7uDLlJN3VT8wR10iDmakt+rC5J2bD6ztjnfcmZxW1XKjz9Ua5mh HwOThAbCkQLOsR/ixcPpSUiaY4+eV9dGgwb5Myko4/KryGWew93TQVzQeluWzmDB ibCy+NsGCi+5uRu4ZCCgAe1qCTEj5TlGzNh3wlq857nJt+5AMtty3jEN0HQyTpWq nyyRIR5dTvIFHikIE7ObF9aqTR5hGwpHQQvuKemj9CPcwxIlLbSxLbKF5UKzUJbl VNqY04f1ql80ZvWIJ13D9QWM/IedOmij2N2kVfeEqgmg== ARC-Authentication-Results: i=1; mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx3.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933049AbeBWSm2 (ORCPT ); Fri, 23 Feb 2018 13:42:28 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:41518 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932515AbeBWSm0 (ORCPT ); Fri, 23 Feb 2018 13:42:26 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+e4d4f9ddd4295539735d@syzkaller.appspotmail.com, Jason Wang , "Michael S. Tsirkin" , "David S. Miller" Subject: [PATCH 4.9 012/145] ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE Date: Fri, 23 Feb 2018 19:25:18 +0100 Message-Id: <20180223170726.257211330@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180223170724.669759283@linuxfoundation.org> References: <20180223170724.669759283@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang commit 6e6e41c3112276288ccaf80c70916779b84bb276 upstream. To avoid slab to warn about exceeded size, fail early if queue occupies more than KMALLOC_MAX_SIZE. Reported-by: syzbot+e4d4f9ddd4295539735d@syzkaller.appspotmail.com Fixes: 2e0ab8ca83c12 ("ptr_ring: array based FIFO for pointers") Signed-off-by: Jason Wang Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/linux/ptr_ring.h | 2 ++ 1 file changed, 2 insertions(+) --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -351,6 +351,8 @@ static inline void *ptr_ring_consume_bh( static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp) { + if (size * sizeof(void *) > KMALLOC_MAX_SIZE) + return NULL; return kcalloc(size, sizeof(void *), gfp); }