Fix: block instrumentation 4.14+ NULL pointer dereference

Fix: block instrumentation 4.14+ NULL pointer dereference

Support for block layer instrumentation on Linux kernels 4.14+
introduces the following NULL pointer dereference:

181.6723  [ 3819.390121] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
181.6724  [ 3819.394856] IP: __event_probe__block_get_rq+0x127/0x4a0 [lttng_probe_block]
181.6725  [ 3819.394856] PGD 7b924067 P4D 7b924067 PUD 733a7067 PMD 0
181.6726  [ 3819.394856] Oops: 0000 [#1] SMP
181.6727  [ 3819.394856] Modules linked in: lttng_test(OE) lttng_probe_x86_exceptions(OE) lttng_probe_x86_irq_vectors(OE) lttng_probe_writeback(OE) lttng_probe_workqueue(OE) lttng_probe_vmscan(OE) lttng_probe_udp(OE) lttng_probe_timer(OE) lttng_probe_sunrpc(OE) lttng_probe_statedump(OE) lttng_probe_sock(OE) lttng_probe_skb(OE) lttng_probe_signal(OE) lttng_probe_scsi(OE) lttng_probe_sched(OE) lttng_probe_regulator(OE) lttng_probe_regmap(OE) lttng_probe_rcu(OE) lttng_probe_random(OE) lttng_probe_printk(OE) lttng_probe_power(OE) lttng_probe_net(OE) lttng_probe_napi(OE) lttng_probe_module(OE) lttng_probe_kvm_x86_mmu(OE) lttng_probe_kvm_x86(OE) lttng_probe_kvm(OE) lttng_probe_kmem(OE) lttng_probe_jbd2(OE) lttng_probe_irq(OE) lttng_probe_i2c(OE) lttng_probe_gpio(OE) lttng_probe_ext4(OE) lttng_probe_compaction(OE) lttng_probe_btrfs(OE)
181.6728  [ 3819.394856] lttng_probe_block(OE) lttng_ring_buffer_metadata_mmap_client(OE) lttng_ring_buffer_client_mmap_overwrite(OE) lttng_ring_buffer_client_mmap_discard(OE) lttng_ring_buffer_metadata_client(OE) lttng_ring_buffer_client_overwrite(OE) lttng_ring_buffer_client_discard(OE) lttng_tracer(OE) lttng_statedump(OE) lttng_ftrace(OE) lttng_kprobes(OE) lttng_clock(OE) lttng_lib_ring_buffer(OE) lttng_kretprobes(OE) [last unloaded: lttng_statedump]
181.6729  [ 3819.394856] CPU: 1 PID: 17541 Comm: kworker/u4:2 Tainted: G OE 4.14.0 #1
181.6730  [ 3819.394856] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
181.6731  [ 3819.394856] Workqueue: events_freezable_power_ disk_events_workfn
181.6732  [ 3819.394856] task: ffff9cd5b9bb1cc0 task.stack: ffffbf4100444000
181.6733  [ 3819.394856] RIP: 0010:__event_probe__block_get_rq+0x127/0x4a0 [lttng_probe_block]
181.6734  [ 3819.394856] RSP: 0018:ffffbf4100447b40 EFLAGS: 00010246
181.6735  [ 3819.394856] RAX: 0000000000000000 RBX: ffff9cd5b39757a8 RCX: ffff9cd5ae850000
181.6736  [ 3819.394856] RDX: 000000000000042a RSI: 0000000000000bd6 RDI: ffffdf40ffd04470
181.6737  [ 3819.394856] RBP: ffffbf4100447c50 R08: 0000000000800000 R09: 0000000000019bd6
181.6738  [ 3819.394856] R10: ffffdf40ffd04470 R11: 0000000000000000 R12: 0000000000000000
181.6739  [ 3819.394856] R13: 000000000001d060 R14: ffff9cd5bb9988a0 R15: ffff9cd5b992b480
181.6740  [ 3819.394856] FS: 0000000000000000(0000) GS:ffff9cd5bfd00000(0000) knlGS:0000000000000000
181.6741  [ 3819.394856] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
181.6742  [ 3819.394856] CR2: 0000000000000008 CR3: 00000000736ab000 CR4: 00000000000006e0
181.6743  [ 3819.394856] Call Trace:
181.6744  [ 3819.394856] ? scsi_old_init_rq+0x84/0x100
181.6745  [ 3819.394856] ? mempool_alloc+0x5f/0x150
181.6746  [ 3819.394856] ? kvm_clock_read+0x1e/0x20
181.6747  [ 3819.394856] get_request+0x4db/0x7e0
181.6748  [ 3819.394856] ? wait_woken+0x80/0x80
181.6749  [ 3819.394856] blk_get_request+0x9c/0x110
181.6750  [ 3819.394856] scsi_execute+0x40/0x260
181.6751  [ 3819.394856] sr_check_events+0x7d/0x290
181.6752  [ 3819.394856] cdrom_check_events+0x18/0x30
181.6753  [ 3819.394856] sr_block_check_events+0x2a/0x30
181.6754  [ 3819.394856] disk_check_events+0x51/0x130
181.6755  [ 3819.394856] disk_events_workfn+0x16/0x20
181.6756  [ 3819.394856] process_one_work+0x156/0x3f0
181.6757  [ 3819.394856] worker_thread+0x4b/0x460
181.6758  [ 3819.394856] kthread+0x109/0x140
181.6759  [ 3819.394856] ? process_one_work+0x3f0/0x3f0
181.6760  [ 3819.394856] ? kthread_create_on_node+0x40/0x40
181.6761  [ 3819.394856] ret_from_fork+0x25/0x30
181.6762  [ 3819.394856] Code: 00 00 00 00 48 89 85 20 ff ff ff 48 8d 85 10 ff ff ff 8b 73 04 48 89 85 28 ff ff ff 49 8b 47 48 ff 50 28 85 c0 0f 88 78 01 00 00 <49> 8b 44 24 08 ba 04 00 00 00 48 8d b5 08 ff ff ff 48 8d bd 20
181.6763  [ 3819.394856] RIP: __event_probe__block_get_rq+0x127/0x4a0 [lttng_probe_block] RSP: ffffbf4100447b40
181.6764  [ 3819.394856] CR2: 0000000000000008
181.6765  [ 3819.394856] ---[ end trace b08f087751369a25 ]---

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>