BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:276 [inline]
BUG: KASAN: use-after-free in atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline]
BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:44 [inline]
BUG: KASAN: use-after-free in packet_getsockopt+0xc72/0xe00 net/packet/af_packet.c:3932
Read of size 8 at addr ffff8801d0126558 by task syz-executor5/3261

CPU: 0 PID: 3261 Comm: syz-executor5 Not tainted 4.14.0-rc5-mm1+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:276 [inline]
 atomic64_read arch/x86/include/asm/atomic64_64.h:21 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:44 [inline]
 packet_getsockopt+0xc72/0xe00 net/packet/af_packet.c:3932
 SYSC_getsockopt net/socket.c:1882 [inline]
 SyS_getsockopt+0x178/0x340 net/socket.c:1864
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452719
RSP: 002b:00007f2a45499be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452719
RDX: 0000000000000015 RSI: 0000000000000107 RDI: 0000000000000011
RBP: 0000000000000082 R08: 00000000208a5000 R09: 0000000000000000
R10: 0000000020ec8000 R11: 0000000000000212 R12: 00000000006f6560
R13: 00000000ffffffff R14: 00007f2a4549a6d4 R15: 0000000000000002

Allocated by task 3257:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3614
 kmalloc include/linux/slab.h:502 [inline]
 kzalloc include/linux/slab.h:691 [inline]
 fanout_add+0x27e/0x1480 net/packet/af_packet.c:1692
 packet_setsockopt+0xfdc/0x1e80 net/packet/af_packet.c:3803
 SYSC_setsockopt net/socket.c:1851 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1830
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 3257:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3492 [inline]
 kfree+0xca/0x250 mm/slab.c:3807
 fanout_add+0x432/0x1480 net/packet/af_packet.c:1770
 packet_setsockopt+0xfdc/0x1e80 net/packet/af_packet.c:3803
 SYSC_setsockopt net/socket.c:1851 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1830
 entry_SYSCALL_64_fastpath+0x1f/0xbe

The buggy address belongs to the object at ffff8801d0126540
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 24 bytes inside of
 128-byte region [ffff8801d0126540, ffff8801d01265c0)
The buggy address belongs to the page:
page:ffffea0007404980 count:1 mapcount:0 mapping:ffff8801d0126000 index:0x0
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801d0126000 0000000000000000 0000000100000015
raw: ffffea000743b0a0 ffffea00074043a0 ffff8801dac00640 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d0126400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801d0126480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d0126500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                    ^
 ffff8801d0126580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801d0126600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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