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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 68D38C43463 for ; Fri, 18 Sep 2020 02:53:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 31A5C235F8 for ; Fri, 18 Sep 2020 02:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600397601; bh=+O8ocp5By/WmYy8EcFwnY9hB1yiYzE6Ub4ilQkH/beU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=09BnLNkdixNl3NIPxrA6514CFuQDgRGJcXK5RhPqRAohMkkapaKIC6Y9D92HMMDXT dauenVR2jDYQJWFM937a8r+slipbrZjya76pqoqKNr+6DgZlmqbE3/aA1bY0X8UeTk jGieqVdpu4nKxRi9uk0EQFdwIFq9nVk9y982bpM0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728193AbgIRCxT (ORCPT ); Thu, 17 Sep 2020 22:53:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:58576 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728008AbgIRCHw (ORCPT ); Thu, 17 Sep 2020 22:07:52 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EBBD4239A1; Fri, 18 Sep 2020 02:07:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600394871; bh=+O8ocp5By/WmYy8EcFwnY9hB1yiYzE6Ub4ilQkH/beU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ijg3GOKNnLO40pLfDY2ffmncxeRne1QtXDl/H4HqmR4NYJmfSZhxb6IunFJsueAS8 T6hXj57J3ySfspjv8Gw0oxU6KxZokyiZHTgFAE6G8+JF79uycL2QKcIakcHJc6Foz8 Mb99qL1DhvqiTuYwOYBTyu4/4ZtsFkk/3VI/HjRQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hou Tao , syzbot+f317896aae32eb281a58@syzkaller.appspotmail.com, Sascha Hauer , Richard Weinberger , Sasha Levin , linux-mtd@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 323/330] ubi: fastmap: Free unused fastmap anchor peb during detach Date: Thu, 17 Sep 2020 22:01:03 -0400 Message-Id: <20200918020110.2063155-323-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020110.2063155-1-sashal@kernel.org> References: <20200918020110.2063155-1-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: Hou Tao [ Upstream commit c16f39d14a7e0ec59881fbdb22ae494907534384 ] When CONFIG_MTD_UBI_FASTMAP is enabled, fm_anchor will be assigned a free PEB during ubi_wl_init() or ubi_update_fastmap(). However if fastmap is not used or disabled on the MTD device, ubi_wl_entry related with the PEB will not be freed during detach. So Fix it by freeing the unused fastmap anchor during detach. Fixes: f9c34bb52997 ("ubi: Fix producing anchor PEBs") Reported-by: syzbot+f317896aae32eb281a58@syzkaller.appspotmail.com Reviewed-by: Sascha Hauer Signed-off-by: Hou Tao Signed-off-by: Richard Weinberger Signed-off-by: Sasha Levin --- drivers/mtd/ubi/fastmap-wl.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/ubi/fastmap-wl.c b/drivers/mtd/ubi/fastmap-wl.c index 426820ab9afe1..b486250923c5a 100644 --- a/drivers/mtd/ubi/fastmap-wl.c +++ b/drivers/mtd/ubi/fastmap-wl.c @@ -39,6 +39,13 @@ static struct ubi_wl_entry *find_anchor_wl_entry(struct rb_root *root) return victim; } +static inline void return_unused_peb(struct ubi_device *ubi, + struct ubi_wl_entry *e) +{ + wl_tree_add(e, &ubi->free); + ubi->free_count++; +} + /** * return_unused_pool_pebs - returns unused PEB to the free tree. * @ubi: UBI device description object @@ -52,8 +59,7 @@ static void return_unused_pool_pebs(struct ubi_device *ubi, for (i = pool->used; i < pool->size; i++) { e = ubi->lookuptbl[pool->pebs[i]]; - wl_tree_add(e, &ubi->free); - ubi->free_count++; + return_unused_peb(ubi, e); } } @@ -361,6 +367,11 @@ static void ubi_fastmap_close(struct ubi_device *ubi) return_unused_pool_pebs(ubi, &ubi->fm_pool); return_unused_pool_pebs(ubi, &ubi->fm_wl_pool); + if (ubi->fm_anchor) { + return_unused_peb(ubi, ubi->fm_anchor); + ubi->fm_anchor = NULL; + } + if (ubi->fm) { for (i = 0; i < ubi->fm->used_blocks; i++) kfree(ubi->fm->e[i]); -- 2.25.1