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BUG: KASAN: slab-out-of-bounds in ip_icmp_error+0x4e1/0x5a0 net/ipv4/ip_sockglue.c:405
Read of size 1 at addr ffff888093265000 by task ksoftirqd/0/9

CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc7-next-20200526-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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 ip_icmp_error+0x4e1/0x5a0 net/ipv4/ip_sockglue.c:405
 tcp_v4_err+0x99e/0x1ce0 net/ipv4/tcp_ipv4.c:576
 icmp_socket_deliver+0x1e1/0x360 net/ipv4/icmp.c:803
 icmp_unreach+0x33b/0xab0 net/ipv4/icmp.c:920
 icmp_rcv+0xee6/0x15f0 net/ipv4/icmp.c:1102
 ip_protocol_deliver_rcu+0x57/0x880 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x220/0x360 net/ipv4/ip_input.c:231
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x1c8/0x4e0 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:441 [inline]
 ip_rcv_finish+0x1da/0x2f0 net/ipv4/ip_input.c:428
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_rcv+0xd0/0x3c0 net/ipv4/ip_input.c:539
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5268
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5382
 process_backlog+0x21e/0x7a0 net/core/dev.c:6214
 napi_poll net/core/dev.c:6659 [inline]
 net_rx_action+0x4e1/0x10d0 net/core/dev.c:6727
 __do_softirq+0x268/0x9ee kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:604 [inline]
 run_ksoftirqd+0x89/0x100 kernel/softirq.c:596
 smpboot_thread_fn+0x653/0x9e0 kernel/smpboot.c:165
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:350

Allocated by task 3880:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 vm_area_dup+0x88/0x2b0 kernel/fork.c:359
 dup_mmap kernel/fork.c:554 [inline]
 dup_mm+0x511/0x1300 kernel/fork.c:1377
 copy_mm kernel/fork.c:1433 [inline]
 copy_process+0x29e3/0x7130 kernel/fork.c:2104
 _do_fork+0x12d/0x1000 kernel/fork.c:2449
 __do_sys_clone+0xef/0x150 kernel/fork.c:2605
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:353
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 6739:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kmem_cache_free+0x7f/0x320 mm/slab.c:3694
 remove_vma+0x132/0x170 mm/mmap.c:192
 exit_mmap+0x354/0x530 mm/mmap.c:3182
 __mmput kernel/fork.c:1099 [inline]
 mmput+0x168/0x4b0 kernel/fork.c:1120
 exit_mm kernel/exit.c:482 [inline]
 do_exit+0xa7d/0x2e00 kernel/exit.c:792
 do_group_exit+0x125/0x340 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:353
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888093265040
 which belongs to the cache vm_area_struct of size 200
The buggy address is located 64 bytes to the left of
 200-byte region [ffff888093265040, ffff888093265108)
The buggy address belongs to the page:
page:ffffea00024c9940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002402188 ffffea00027e5108 ffff8880aa1ec380
raw: 0000000000000000 ffff888093265040 000000010000000f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888093264f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888093264f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888093265000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                   ^
 ffff888093265080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888093265100: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb
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