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BUG: KASAN: use-after-free in skb_release_data+0x5cf/0x790 net/core/skbuff.c:567
Read of size 1 at addr ffff880058858ac2 by task swapper/2/0

CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.13.0-rc5-next-20170815+ #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 <IRQ>
 __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+0x24e/0x340 mm/kasan/report.c:409
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427
 skb_release_data+0x5cf/0x790 net/core/skbuff.c:567
 skb_release_all+0x4a/0x60 net/core/skbuff.c:631
 __kfree_skb net/core/skbuff.c:645 [inline]
 kfree_skb+0x15d/0x4c0 net/core/skbuff.c:663
 inet_frag_destroy+0x121/0x270 net/ipv4/inet_fragment.c:304
 inet_frag_put include/net/inet_frag.h:133 [inline]
 ipq_put net/ipv4/ip_fragment.c:170 [inline]
 ip_expire+0x1be/0x6d0 net/ipv4/ip_fragment.c:254
 call_timer_fn+0x233/0x830 kernel/time/timer.c:1268
 expire_timers kernel/time/timer.c:1307 [inline]
 __run_timers+0x7fd/0xb90 kernel/time/timer.c:1601
 run_timer_softirq+0x21/0x80 kernel/time/timer.c:1614
 __do_softirq+0x2f5/0xba3 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1cc/0x200 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:638 [inline]
 smp_trace_apic_timer_interrupt+0x139/0x6a0 arch/x86/kernel/apic/apic.c:1065
 trace_apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
 </IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
RSP: 0018:ffff88006dab7db0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: 1ffff1000db56fb9 RCX: 0100000000000000
RDX: 1ffffffff0b58d6c RSI: 0000000000000000 RDI: ffffffff85ac6b60
RBP: ffff88006dab7db0 R08: ffffffff857efa90 R09: 1ffff1000db56f4f
R10: ffff88007fff7090 R11: ffff88007fff709d R12: ffffffff85ac6b50
R13: ffff88006dab7e68 R14: 0000000000000000 R15: ffff88006daac040
 arch_safe_halt arch/x86/include/asm/paravirt.h:98 [inline]
 default_idle+0xbf/0x460 arch/x86/kernel/process.c:341
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:332
 default_idle_call+0x36/0x90 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x256/0x3b0 kernel/sched/idle.c:246
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
 start_secondary+0x277/0x310 arch/x86/kernel/smpboot.c:275
 secondary_startup_64+0xa5/0xa5 arch/x86/kernel/head_64.S:235

The buggy address belongs to the page:
page:ffffea0001621600 count:0 mapcount:-127 mapping:          (null) index:0x0
flags: 0x500000000000000()
raw: 0500000000000000 0000000000000000 0000000000000000 00000000ffffff80
raw: ffffea000153d020 ffffea0001494020 0000000000000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880058858980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff880058858a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff880058858a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff880058858b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff880058858b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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