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BUG: KASAN: out-of-bounds in csd_lock_record+0xcb/0xe0 kernel/smp.c:118
Read of size 8 at addr ffffc90016eaf670 by task syz-executor.1/18745

CPU: 0 PID: 18745 Comm: syz-executor.1 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 csd_lock_record+0xcb/0xe0 kernel/smp.c:118
 flush_smp_call_function_queue+0x285/0x730 kernel/smp.c:391
 __sysvec_call_function_single+0x98/0x490 arch/x86/kernel/smp.c:248
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_call_function_single+0xe0/0x120 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:604
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 10 ff b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d ee 7a c8 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 db 01 63 f9 65 8b 05 44 7a 15 78 85 c0 74 02 5d
RSP: 0018:ffffc90016ca7138 EFLAGS: 00000286
RAX: 1ffffffff1369fe2 RBX: ffff8880a3002200 RCX: 0000000000000007
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff87ec83ff
RBP: ffff8880ae635e00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae635e00
R13: ffff8880946445c0 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3184 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3284
 context_switch kernel/sched/core.c:3448 [inline]
 __schedule+0x8bc/0x1e80 kernel/sched/core.c:4169
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4325
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 clear_user_highpage include/linux/highmem.h:231 [inline]
 clear_subpage+0xe0/0x100 mm/memory.c:4898
 process_huge_page mm/memory.c:4852 [inline]
 clear_huge_page+0xab/0x530 mm/memory.c:4912
 __do_huge_pmd_anonymous_page mm/huge_memory.c:589 [inline]
 do_huge_pmd_anonymous_page+0x5cd/0x2230 mm/huge_memory.c:756
 create_huge_pmd mm/memory.c:4110 [inline]
 __handle_mm_fault mm/memory.c:4331 [inline]
 handle_mm_fault+0x35dd/0x43f0 mm/memory.c:4397
 faultin_page mm/gup.c:887 [inline]
 __get_user_pages+0x733/0x1760 mm/gup.c:1113
 __get_user_pages_locked mm/gup.c:1306 [inline]
 get_user_pages_unlocked+0x191/0x650 mm/gup.c:2042
 __gup_longterm_unlocked mm/gup.c:2692 [inline]
 internal_get_user_pages_fast+0x1b2e/0x2a00 mm/gup.c:2765
 get_user_pages_fast+0x49/0x70 mm/gup.c:2861
 iov_iter_get_pages+0x2a2/0x10f2 lib/iov_iter.c:1324
 af_alg_make_sg+0x98/0x400 crypto/af_alg.c:395
 hash_sendmsg+0x380/0xac0 crypto/algif_hash.c:94
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:367
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f152bfd0c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000502860 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000020001f00 RDI: 0000000000000005
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a47 R14: 00000000004cd2e6 R15: 00007f152bfd16d4


Memory state around the buggy address:
 ffffc90016eaf500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90016eaf580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90016eaf600: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
                                                                ^
 ffffc90016eaf680: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90016eaf700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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