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72655c0ebd
This patch fixes the following two complaints:
WARNING: CPU: 3 PID: 1326 at kernel/locking/mutex-debug.c:103 mutex_destroy+0x74/0x80
Modules linked in: scsi_debug sd_mod t10_pi brd scsi_transport_iscsi af_packet crct10dif_pclmul sg aesni_intel glue_helper virtio_balloon button crypto_simd cryptd intel_agp intel_gtt agpgart ip_tables x_tables ipv6 nf_defrag_ipv6 autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid hid sr_mod cdrom ata_generic pata_acpi virtio_blk virtio_net net_failover failover ata_piix xhci_pci ahci libahci xhci_hcd i2c_piix4 libata virtio_pci usbcore i2c_core virtio_ring scsi_mod usb_common virtio [last unloaded: scsi_debug]
CPU: 3 PID: 1326 Comm: systemd-udevd Not tainted 5.6.0-rc1-dbg+ #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
RIP: 0010:mutex_destroy+0x74/0x80
Call Trace:
sr_kref_release+0xb9/0xd0 [sr_mod]
scsi_cd_put+0x79/0x90 [sr_mod]
sr_block_release+0x54/0x70 [sr_mod]
__blkdev_put+0x2ce/0x3c0
blkdev_put+0x68/0x220
blkdev_close+0x4d/0x60
__fput+0x170/0x3b0
____fput+0x12/0x20
task_work_run+0xa2/0xf0
exit_to_usermode_loop+0xeb/0xf0
do_syscall_64+0x2be/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa16d40aab7
BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0x98/0x420
Read of size 8 at addr ffff8881c6e4f4b0 by task systemd-udevd/1326
CPU: 3 PID: 1326 Comm: systemd-udevd Tainted: G W 5.6.0-rc1-dbg+ #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
Call Trace:
dump_stack+0xa5/0xe6
print_address_description.constprop.0+0x46/0x60
__kasan_report.cold+0x7b/0x94
kasan_report+0x16/0x20
check_memory_region+0x140/0x1b0
__kasan_check_read+0x15/0x20
__mutex_unlock_slowpath+0x98/0x420
mutex_unlock+0x16/0x20
sr_block_release+0x5c/0x70 [sr_mod]
__blkdev_put+0x2ce/0x3c0
hardirqs last enabled at (1875522): [<ffffffff81bb0696>] _raw_spin_unlock_irqrestore+0x56/0x70
blkdev_put+0x68/0x220
blkdev_close+0x4d/0x60
__fput+0x170/0x3b0
____fput+0x12/0x20
task_work_run+0xa2/0xf0
exit_to_usermode_loop+0xeb/0xf0
do_syscall_64+0x2be/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa16d40aab7
Allocated by task 3201:
save_stack+0x23/0x90
__kasan_kmalloc.constprop.0+0xcf/0xe0
kasan_kmalloc+0xd/0x10
kmem_cache_alloc_trace+0x161/0x3c0
sr_probe+0x12f/0xb60 [sr_mod]
really_probe+0x183/0x5d0
driver_probe_device+0x13f/0x1a0
__device_attach_driver+0xe6/0x150
bus_for_each_drv+0x101/0x160
__device_attach+0x183/0x230
device_initial_probe+0x17/0x20
bus_probe_device+0x110/0x130
device_add+0xb7b/0xd40
scsi_sysfs_add_sdev+0xe8/0x360 [scsi_mod]
scsi_probe_and_add_lun+0xdc4/0x14c0 [scsi_mod]
__scsi_scan_target+0x12d/0x850 [scsi_mod]
scsi_scan_channel+0xcd/0xe0 [scsi_mod]
scsi_scan_host_selected+0x182/0x190 [scsi_mod]
store_scan+0x1e9/0x200 [scsi_mod]
dev_attr_store+0x42/0x60
sysfs_kf_write+0x8b/0xb0
kernfs_fop_write+0x158/0x250
__vfs_write+0x4c/0x90
vfs_write+0x145/0x2c0
ksys_write+0xd7/0x180
__x64_sys_write+0x47/0x50
do_syscall_64+0x6f/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 1326:
save_stack+0x23/0x90
__kasan_slab_free+0x13a/0x190
kasan_slab_free+0x12/0x20
kfree+0x109/0x410
sr_kref_release+0xc1/0xd0 [sr_mod]
scsi_cd_put+0x79/0x90 [sr_mod]
sr_block_release+0x54/0x70 [sr_mod]
__blkdev_put+0x2ce/0x3c0
blkdev_put+0x68/0x220
blkdev_close+0x4d/0x60
__fput+0x170/0x3b0
____fput+0x12/0x20
task_work_run+0xa2/0xf0
exit_to_usermode_loop+0xeb/0xf0
do_syscall_64+0x2be/0x300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Link: https://lore.kernel.org/r/20200330025151.10535-1-bvanassche@acm.org
Fixes: 51a858817d ("scsi: sr: get rid of sr global mutex")
Cc: Merlijn Wajer <merlijn@archive.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: <stable@kernel.org>
Acked-by: Merlijn Wajer <merlijn@archive.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.