From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1C95113E8B8; Tue, 7 May 2024 23:08:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715123331; cv=none; b=lXAwEtGSBCLkGzq0F/ndt6KunJCXLJW+mDJHieLO6YJJ5GovhCjiAzVz87zmuezI23h91I1jAYiGBLrmSE7hkzXC219I3yKTeC7pJnkQIZAJPzCl5rh6Jx98SZT980LiNarIzFJz7xE6DTedHHlAi1J1d4VpogqN9S4is4PLjcg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715123331; c=relaxed/simple; bh=yqfzzvv4Vb9iFfLKiQtmvaF2w1b07asZiGiRgAATLho=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ji8d2Gw2oCjdfuL2qMChINza7PHSpwQ1RjnBHFUU9LKzUk4PW0In0rYqcDcyLFOntT8algfhaVkeIKK1N/yfM7Ova5/6WFJgBmrFIBjtaQWzg3TMUzVFZatm8MTgfoNemIK6ijJFxceuIu1T4LuXyDoPYsjya2bZCktKK73BaMs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JbIzx5eJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JbIzx5eJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A19EEC2BBFC; Tue, 7 May 2024 23:08:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1715123330; bh=yqfzzvv4Vb9iFfLKiQtmvaF2w1b07asZiGiRgAATLho=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JbIzx5eJKTFtd8mz8HF0R4R/P6SAOmLhIHt4kKOWURjuYoby+AnzZ8LRuBKzIY1wb Tk0Zs6dtIyXxYAGdFuWs5hoGGpzthL4lKN4Ft8sIvZEEda96aK+gdOHYuXkElXlJsq 4BFKfolgOVLVcQNH106WiswGC4138586ZMJuYLfUrc+Dy0rU+PNzoMrTYRyil3QL4a Wb5QtgQ7++6QvgwKrrZMPKqj4MyPBaxuGnbQI3BLF+JN89lVEZ97TO0Vqm+rF2NrUV 9aPqUAxnwuxdgVTzqFGAW/yjDg9Q4gxK/Jl1ed3DuHHY0YBSiWXsKcCYNQVF5yX9R6 jq1xLURwTtpcQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Christian Brauner , Baokun Li , Jingbo Xu , Gao Xiang , Chao Yu , Sasha Levin , xiang@kernel.org, linux-erofs@lists.ozlabs.org Subject: [PATCH AUTOSEL 6.8 26/52] erofs: reliably distinguish block based and fscache mode Date: Tue, 7 May 2024 19:06:52 -0400 Message-ID: <20240507230800.392128-26-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240507230800.392128-1-sashal@kernel.org> References: <20240507230800.392128-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.8.9 Content-Transfer-Encoding: 8bit From: Christian Brauner [ Upstream commit 7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 ] When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning: ============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================ Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes. Signed-off-by: Christian Brauner Signed-off-by: Baokun Li Reviewed-by: Jingbo Xu Reviewed-by: Gao Xiang Reviewed-by: Chao Yu Link: https://lore.kernel.org/r/20240419123611.947084-3-libaokun1@huawei.com Signed-off-by: Gao Xiang Signed-off-by: Sasha Levin --- fs/erofs/super.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 24788c230b494..020495168b124 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -800,17 +800,13 @@ static int erofs_init_fs_context(struct fs_context *fc) static void erofs_kill_sb(struct super_block *sb) { - struct erofs_sb_info *sbi; + struct erofs_sb_info *sbi = EROFS_SB(sb); - if (erofs_is_fscache_mode(sb)) + if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid) kill_anon_super(sb); else kill_block_super(sb); - sbi = EROFS_SB(sb); - if (!sbi) - return; - erofs_free_dev_context(sbi->devs); fs_put_dax(sbi->dax_dev, NULL); erofs_fscache_unregister_fs(sb); -- 2.43.0