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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27728C433FE for ; Sun, 9 Oct 2022 22:55:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233806AbiJIWxf (ORCPT ); Sun, 9 Oct 2022 18:53:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233430AbiJIWwE (ORCPT ); Sun, 9 Oct 2022 18:52:04 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0FB8349B4F; Sun, 9 Oct 2022 15:28:12 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E3519B80DD2; Sun, 9 Oct 2022 22:27:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69975C433D6; Sun, 9 Oct 2022 22:27:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665354440; bh=/XB4y2LpgVtKSLfj2FRGEXMsobFlbWAbbPzG5tqVxqA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F6Cm1zMUhUewj9NEyJw1oAPXBe/N5R3UI70hyMC4Qy8QDfUUI3ME4Oo2kMMFqLJvz RlMfw1Caabm3lq0FMFfn6wGzC7nuCnrXTx1COfLV73YNG458QzItZ9NewmiTynQVra wEj21l5fINpbNccrIhp3cSt6nrUta82/+wdZQdCRPwy76T94O9OdRFLXXT93x53yFm 5yb/goxLYR2oLYt6HELAvAABpQh62P6GwwhtITWJ6yw+F4Mn9IsvFvQ5CtMAYBfq/G /zQypWARr/75wFq5M0gjMdNfIXdbWDCY1HvF9fjqYnNDvBQUmi0YQkxj0s4ef6eC60 MXiLgPf5QvTaA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Khalid Masum , Herbert Xu , syzbot+5ec9bb042ddfe9644773@syzkaller.appspotmail.com, Steffen Klassert , Sasha Levin , davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 04/16] xfrm: Update ipcomp_scratches with NULL when freed Date: Sun, 9 Oct 2022 18:27:00 -0400 Message-Id: <20221009222713.1220394-4-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221009222713.1220394-1-sashal@kernel.org> References: <20221009222713.1220394-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Khalid Masum [ Upstream commit 8a04d2fc700f717104bfb95b0f6694e448a4537f ] Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed Suggested-by: Herbert Xu Reported-by: syzbot+5ec9bb042ddfe9644773@syzkaller.appspotmail.com Tested-by: syzbot+5ec9bb042ddfe9644773@syzkaller.appspotmail.com Signed-off-by: Khalid Masum Acked-by: Herbert Xu Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin --- net/xfrm/xfrm_ipcomp.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c index a00ec715aa46..32aed1d0f6ee 100644 --- a/net/xfrm/xfrm_ipcomp.c +++ b/net/xfrm/xfrm_ipcomp.c @@ -216,6 +216,7 @@ static void ipcomp_free_scratches(void) vfree(*per_cpu_ptr(scratches, i)); free_percpu(scratches); + ipcomp_scratches = NULL; } static void * __percpu *ipcomp_alloc_scratches(void) -- 2.35.1