[SCSI] fix crash when disconnecting usb storage
__scsi_remove_device() in scsi_forget_host() is executed out of scan_mutex
and races with scsi_destroy_sdev() <- scsi_sysfs_add_devices() <-
scsi_finish_async_scan(). The result is use after free and/or double
free, oops.
The fix is simple, move scsi_forget_host() under scan_mutex.
scsi_forget_host() is just sequence of __scsi_remove_device(). All
another calls of __scsi_remove_device() are made under scan_mutex. So
that it is safe.
Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
1 file changed