From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423306AbeE1LGl (ORCPT ); Mon, 28 May 2018 07:06:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:53362 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423219AbeE1LGa (ORCPT ); Mon, 28 May 2018 07:06:30 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lee Duncan , Jan Kara , Jens Axboe , Sasha Levin Subject: [PATCH 4.16 059/272] sr: get/drop reference to device in revalidate and check_events Date: Mon, 28 May 2018 12:01:32 +0200 Message-Id: <20180528100245.857689139@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180528100240.256525891@linuxfoundation.org> References: <20180528100240.256525891@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jens Axboe [ Upstream commit 2d097c50212e137e7b53ffe3b37561153eeba87d ] We can't just use scsi_cd() to get the scsi_cd structure, we have to grab a live reference to the device. For both callbacks, we're not inside an open where we already hold a reference to the device. This fixes device removal/addition under concurrent device access, which otherwise could result in the below oops. NULL pointer dereference at 0000000000000010 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP Modules linked in: sr 12:0:0:0: [sr2] scsi-1 drive scsi_debug crc_t10dif crct10dif_generic crct10dif_common nvme nvme_core sb_edac xl sr 12:0:0:0: Attached scsi CD-ROM sr2 sr_mod cdrom btrfs xor zstd_decompress zstd_compress xxhash lzo_compress zlib_defc sr 12:0:0:0: Attached scsi generic sg7 type 5 igb ahci libahci i2c_algo_bit libata dca [last unloaded: crc_t10dif] CPU: 43 PID: 4629 Comm: systemd-udevd Not tainted 4.16.0+ #650 Hardware name: Dell Inc. PowerEdge T630/0NT78X, BIOS 2.3.4 11/09/2016 RIP: 0010:sr_block_revalidate_disk+0x23/0x190 [sr_mod] RSP: 0018:ffff883ff357bb58 EFLAGS: 00010292 RAX: ffffffffa00b07d0 RBX: ffff883ff3058000 RCX: ffff883ff357bb66 RDX: 0000000000000003 RSI: 0000000000007530 RDI: ffff881fea631000 RBP: 0000000000000000 R08: ffff881fe4d38400 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000000001b6 R12: 000000000800005d R13: 000000000800005d R14: ffff883ffd9b3790 R15: 0000000000000000 FS: 00007f7dc8e6d8c0(0000) GS:ffff883fff340000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 0000003ffda98005 CR4: 00000000003606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? __invalidate_device+0x48/0x60 check_disk_change+0x4c/0x60 sr_block_open+0x16/0xd0 [sr_mod] __blkdev_get+0xb9/0x450 ? iget5_locked+0x1c0/0x1e0 blkdev_get+0x11e/0x320 ? bdget+0x11d/0x150 ? _raw_spin_unlock+0xa/0x20 ? bd_acquire+0xc0/0xc0 do_dentry_open+0x1b0/0x320 ? inode_permission+0x24/0xc0 path_openat+0x4e6/0x1420 ? cpumask_any_but+0x1f/0x40 ? flush_tlb_mm_range+0xa0/0x120 do_filp_open+0x8c/0xf0 ? __seccomp_filter+0x28/0x230 ? _raw_spin_unlock+0xa/0x20 ? __handle_mm_fault+0x7d6/0x9b0 ? list_lru_add+0xa8/0xc0 ? _raw_spin_unlock+0xa/0x20 ? __alloc_fd+0xaf/0x160 ? do_sys_open+0x1a6/0x230 do_sys_open+0x1a6/0x230 do_syscall_64+0x5a/0x100 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Reviewed-by: Lee Duncan Reviewed-by: Jan Kara Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/sr.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -585,18 +585,28 @@ out: static unsigned int sr_block_check_events(struct gendisk *disk, unsigned int clearing) { - struct scsi_cd *cd = scsi_cd(disk); + unsigned int ret = 0; + struct scsi_cd *cd; - if (atomic_read(&cd->device->disk_events_disable_depth)) + cd = scsi_cd_get(disk); + if (!cd) return 0; - return cdrom_check_events(&cd->cdi, clearing); + if (!atomic_read(&cd->device->disk_events_disable_depth)) + ret = cdrom_check_events(&cd->cdi, clearing); + + scsi_cd_put(cd); + return ret; } static int sr_block_revalidate_disk(struct gendisk *disk) { - struct scsi_cd *cd = scsi_cd(disk); struct scsi_sense_hdr sshdr; + struct scsi_cd *cd; + + cd = scsi_cd_get(disk); + if (!cd) + return -ENXIO; /* if the unit is not ready, nothing more to do */ if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) @@ -605,6 +615,7 @@ static int sr_block_revalidate_disk(stru sr_cd_check(&cd->cdi); get_sectorsize(cd); out: + scsi_cd_put(cd); return 0; }