KASAN: user-memory-access Read in filp

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: user-memory-access Read in filp_close (2) fs				1	1385d	1380d	0/26	auto-closed as invalid on 2020/09/09 16:56

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BUG: KASAN: user-memory-access in instrument_atomic_read include/linux/instrumented.h:56 [inline]
BUG: KASAN: user-memory-access in atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline]
BUG: KASAN: user-memory-access in atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
BUG: KASAN: user-memory-access in filp_close+0x22/0x170 fs/open.c:1276
Read of size 8 at addr 0000000100000078 by task syz-executor.4/4734

CPU: 1 PID: 4734 Comm: syz-executor.4 Not tainted 5.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xf6/0x16e lib/dump_stack.c:118
 __kasan_report mm/kasan/report.c:517 [inline]
 kasan_report.cold+0x6a/0x7c mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x173/0x1d0 mm/kasan/generic.c:192
 instrument_atomic_read include/linux/instrumented.h:56 [inline]
 atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
 filp_close+0x22/0x170 fs/open.c:1276
 __close_fd+0x133/0x200 fs/file.c:641
 __do_sys_close fs/open.c:1301 [inline]
 __se_sys_close fs/open.c:1299 [inline]
 __x64_sys_close+0x69/0x100 fs/open.c:1299
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x416661
Code: Bad RIP value.
RSP: 002b:00007fffd0a28390 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 0000000000416661
RDX: 0000000000000000 RSI: 000000000000174a RDI: 0000000000000007
RBP: 0000000000000001 R08: 00000000accc774a R09: 00000000accc774e
R10: 00007fffd0a28480 R11: 0000000000000293 R12: 000000000078c900
R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078bfac
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