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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6098C10F14 for ; Thu, 3 Oct 2019 17:40:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9347820830 for ; Thu, 3 Oct 2019 17:40:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570124459; bh=tZ0vg3dZimMEgTi2SUGe7lP4Vh6YFUj0YqBXkUubxTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hYEak5Oj7I8TUWVuyHS83KydZXa77S6EXU6EufAHTTig4rRzeafbpSwc4HFEu1NiE LLnzMFm7IErompFSNORJuXCzhs3Gvv1R70hf5Lwp4vXJjpec+c6jBS1Y3AwShOSz/v 4pZ1Wu5zvjZoVDsWclXBbw8HFCPJGrRUS8wtkpKo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390002AbfJCRk6 (ORCPT ); Thu, 3 Oct 2019 13:40:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:42514 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731339AbfJCP7a (ORCPT ); Thu, 3 Oct 2019 11:59:30 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 65D0E207FF; Thu, 3 Oct 2019 15:59:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118369; bh=tZ0vg3dZimMEgTi2SUGe7lP4Vh6YFUj0YqBXkUubxTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oKeKwVHm/+gCRcux6FIGpoj2YApCB9LmBpFhwsI1wBXMSZ7Strm/P+XKsHLb9Siv+ MIzmr854o/HDxXrmwLV8hKVPYwewMpJPNlKFHOoP/sfkOAJhobslXjQPWU9Rx+tVE7 3j/1sBBbaj1oCWBDyK08MR3HoKwFuJYUABS1ifsk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, chenzefeng , Tony Luck , Sasha Levin Subject: [PATCH 4.4 48/99] ia64:unwind: fix double free for mod->arch.init_unw_table Date: Thu, 3 Oct 2019 17:53:11 +0200 Message-Id: <20191003154318.587383181@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154252.297991283@linuxfoundation.org> References: <20191003154252.297991283@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: chenzefeng [ Upstream commit c5e5c48c16422521d363c33cfb0dcf58f88c119b ] The function free_module in file kernel/module.c as follow: void free_module(struct module *mod) { ...... module_arch_cleanup(mod); ...... module_arch_freeing_init(mod); ...... } Both module_arch_cleanup and module_arch_freeing_init function would free the mod->arch.init_unw_table, which cause double free. Here, set mod->arch.init_unw_table = NULL after remove the unwind table to avoid double free. Signed-off-by: chenzefeng Signed-off-by: Tony Luck Signed-off-by: Sasha Levin --- arch/ia64/kernel/module.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c index 36b2c94a8eb5d..14c7184daaf64 100644 --- a/arch/ia64/kernel/module.c +++ b/arch/ia64/kernel/module.c @@ -912,8 +912,12 @@ module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mo void module_arch_cleanup (struct module *mod) { - if (mod->arch.init_unw_table) + if (mod->arch.init_unw_table) { unw_remove_unwind_table(mod->arch.init_unw_table); - if (mod->arch.core_unw_table) + mod->arch.init_unw_table = NULL; + } + if (mod->arch.core_unw_table) { unw_remove_unwind_table(mod->arch.core_unw_table); + mod->arch.core_unw_table = NULL; + } } -- 2.20.1