From patchwork Wed Sep 23 08:45:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jaegeuk Kim X-Patchwork-Id: 11794293 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A7894139F for ; Wed, 23 Sep 2020 08:45:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F8FA2220D for ; Wed, 23 Sep 2020 08:45:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600850718; bh=XiMksB5vz2ze+VmO+JGKzgUGIZoRdpPjoIOpgvM1pXk=; h=From:To:Cc:Subject:Date:List-ID:From; b=hQXVhQk9SHyUQOsp+j2QwepBROjGuzJ7BUmK/tjibzzUhngSdTTf1yb2fLSarj/VQ 3dJfFGKGkN0yjtMXskvBhnbmtpPjejisBcoZwebYQFHfS0tBrAKM04hsVzhXYW+609 ryxjdUoEX/qBpDmqjdc4bWoY0Y6NggfCQSBnVy4k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726406AbgIWIpP (ORCPT ); Wed, 23 Sep 2020 04:45:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:48558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726130AbgIWIpP (ORCPT ); Wed, 23 Sep 2020 04:45:15 -0400 Received: from localhost (unknown [104.132.1.66]) (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 F35D8221F0; Wed, 23 Sep 2020 08:45:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600850714; bh=XiMksB5vz2ze+VmO+JGKzgUGIZoRdpPjoIOpgvM1pXk=; h=From:To:Cc:Subject:Date:From; b=h2xwP5DQ0bctD7XTG5Z6nKDVDxbn+URT70n7ElGTtzrGj47WkvlDo5ns9tkht1apq dCFDwDzfuvFBc64PyzX+Y+Uc7IGyzOZnnDbZ1adriwxnzLOzOFAa0LF3t7EBLJIArg VjtTePTWiddXb2CK7kpbY2eiXpzxaP9P/2piwZjk= From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, kernel-team@android.com Cc: Jaegeuk Kim Subject: [PATCH] f2fs: fix slab leak of rpages pointer Date: Wed, 23 Sep 2020 01:45:12 -0700 Message-Id: <20200923084512.2947439-1-jaegeuk@kernel.org> X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org This fixes the below mem leak. [ 130.157600] ============================================================================= [ 130.159662] BUG f2fs_page_array_entry-252:16 (Tainted: G W O ): Objects remaining in f2fs_page_array_entry-252:16 on __kmem_cache_shutdown() [ 130.162742] ----------------------------------------------------------------------------- [ 130.162742] [ 130.164979] Disabling lock debugging due to kernel taint [ 130.166188] INFO: Slab 0x000000009f5a52d2 objects=22 used=4 fp=0x00000000ba72c3e9 flags=0xfffffc0010200 [ 130.168269] CPU: 7 PID: 3560 Comm: umount Tainted: G B W O 5.9.0-rc4+ #35 [ 130.170019] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1 04/01/2014 [ 130.171941] Call Trace: [ 130.172528] dump_stack+0x74/0x9a [ 130.173298] slab_err+0xb7/0xdc [ 130.174044] ? kernel_poison_pages+0xc0/0xc0 [ 130.175065] ? on_each_cpu_cond_mask+0x48/0x90 [ 130.176096] __kmem_cache_shutdown.cold+0x34/0x141 [ 130.177190] kmem_cache_destroy+0x59/0x100 [ 130.178223] f2fs_destroy_page_array_cache+0x15/0x20 [f2fs] [ 130.179527] f2fs_put_super+0x1bc/0x380 [f2fs] [ 130.180538] generic_shutdown_super+0x72/0x110 [ 130.181547] kill_block_super+0x27/0x50 [ 130.182438] kill_f2fs_super+0x76/0xe0 [f2fs] [ 130.183448] deactivate_locked_super+0x3b/0x80 [ 130.184456] deactivate_super+0x3e/0x50 [ 130.185363] cleanup_mnt+0x109/0x160 [ 130.186179] __cleanup_mnt+0x12/0x20 [ 130.187003] task_work_run+0x70/0xb0 [ 130.187841] exit_to_user_mode_prepare+0x18f/0x1b0 [ 130.188917] syscall_exit_to_user_mode+0x31/0x170 [ 130.189989] do_syscall_64+0x45/0x90 [ 130.190828] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 130.191986] RIP: 0033:0x7faf868ea2eb [ 130.192815] Code: 7b 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 75 7b 0c 00 f7 d8 64 89 01 [ 130.196872] RSP: 002b:00007fffb7edb478 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 130.198494] RAX: 0000000000000000 RBX: 00007faf86a18204 RCX: 00007faf868ea2eb [ 130.201021] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055971df71c50 [ 130.203415] RBP: 000055971df71a40 R08: 0000000000000000 R09: 00007fffb7eda1f0 [ 130.205772] R10: 00007faf86a04339 R11: 0000000000000246 R12: 000055971df71c50 [ 130.208150] R13: 0000000000000000 R14: 000055971df71b38 R15: 0000000000000000 [ 130.210515] INFO: Object 0x00000000a980843a @offset=744 [ 130.212476] INFO: Allocated in page_array_alloc+0x3d/0xe0 [f2fs] age=1572 cpu=0 pid=3297 [ 130.215030] __slab_alloc+0x20/0x40 [ 130.216566] kmem_cache_alloc+0x2a0/0x2e0 [ 130.218217] page_array_alloc+0x3d/0xe0 [f2fs] [ 130.219940] f2fs_init_compress_ctx+0x1f/0x40 [f2fs] [ 130.221736] f2fs_write_cache_pages+0x3db/0x860 [f2fs] [ 130.223591] f2fs_write_data_pages+0x2c9/0x300 [f2fs] [ 130.225414] do_writepages+0x43/0xd0 [ 130.226907] __filemap_fdatawrite_range+0xd5/0x110 [ 130.228632] filemap_write_and_wait_range+0x48/0xb0 [ 130.230336] __generic_file_write_iter+0x18a/0x1d0 [ 130.232035] f2fs_file_write_iter+0x226/0x550 [f2fs] [ 130.233737] new_sync_write+0x113/0x1a0 [ 130.235204] vfs_write+0x1a6/0x200 [ 130.236579] ksys_write+0x67/0xe0 [ 130.237898] __x64_sys_write+0x1a/0x20 [ 130.239309] do_syscall_64+0x38/0x90 Signed-off-by: Jaegeuk Kim --- fs/f2fs/compress.c | 2 +- fs/f2fs/data.c | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index 10a9f39b9d6a2..f086ac43ca825 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -159,7 +159,7 @@ struct page *f2fs_compress_control_page(struct page *page) int f2fs_init_compress_ctx(struct compress_ctx *cc) { - if (cc->nr_rpages) + if (cc->rpages) return 0; cc->rpages = page_array_alloc(cc->inode); diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index db020a74fd849..ee87407602fa7 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -3129,6 +3129,8 @@ static int f2fs_write_cache_pages(struct address_space *mapping, retry = 0; } } + if (f2fs_compressed_file(inode)) + f2fs_destroy_compress_ctx(&cc); #endif if (retry) { index = 0;