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BUG: KASAN: use-after-free in memcpy include/linux/fortify-string.h:191 [inline]
BUG: KASAN: use-after-free in page_to_skb+0x5cf/0xb70 drivers/net/virtio_net.c:480
Read of size 12 at addr ffff88802ad2f800 by task ifupdown-hotplu/8238

CPU: 1 PID: 8238 Comm: ifupdown-hotplu Not tainted 5.12.0-rc7-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
 check_region_inline mm/kasan/generic.c:180 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
 memcpy+0x20/0x60 mm/kasan/shadow.c:65
 memcpy include/linux/fortify-string.h:191 [inline]
 page_to_skb+0x5cf/0xb70 drivers/net/virtio_net.c:480
 receive_mergeable drivers/net/virtio_net.c:1009 [inline]
 receive_buf+0x2b82/0x6220 drivers/net/virtio_net.c:1119
 virtnet_receive drivers/net/virtio_net.c:1411 [inline]
 virtnet_poll+0x568/0x10b0 drivers/net/virtio_net.c:1516
 __napi_poll+0xaf/0x440 net/core/dev.c:6962
 napi_poll net/core/dev.c:7029 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:7116
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu kernel/softirq.c:422 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
 common_interrupt+0xa4/0xd0 arch/x86/kernel/irq.c:240
 </IRQ>
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
Code: 74 24 10 e8 aa dd 4d f8 48 89 ef e8 e2 93 4e f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> c3 61 42 f8 65 8b 05 8c 27 f6 76 85 c0 74 0a 5b 5d c3 e8 30 1d
RSP: 0018:ffffc9000c27fa48 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1f5c2c2
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff88801a664190 R08: 0000000000000001 R09: ffffffff8fad48c7
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880b9d35280
R13: 0000000000000206 R14: ffff88801a664190 R15: ffff8880b9d35298
 try_to_wake_up+0x62d/0x14a0 kernel/sched/core.c:3466
 wake_up_process kernel/sched/core.c:3533 [inline]
 wake_up_q+0x96/0x100 kernel/sched/core.c:587
 rwsem_wake kernel/locking/rwsem.c:1179 [inline]
 __up_write kernel/locking/rwsem.c:1322 [inline]
 up_write+0x241/0x560 kernel/locking/rwsem.c:1459
 i_mmap_unlock_write include/linux/fs.h:505 [inline]
 __vma_adjust+0xf24/0x25f0 mm/mmap.c:942
 vma_adjust include/linux/mm.h:2505 [inline]
 __split_vma+0x467/0x550 mm/mmap.c:2764
 split_vma+0x9f/0xe0 mm/mmap.c:2796
 mprotect_fixup+0x678/0x940 mm/mprotect.c:467
 do_mprotect_pkey+0x5c7/0xa50 mm/mprotect.c:626
 __do_sys_mprotect mm/mprotect.c:652 [inline]
 __se_sys_mprotect mm/mprotect.c:649 [inline]
 __x64_sys_mprotect+0x74/0xb0 mm/mprotect.c:649
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe1563943a7
Code: ff 66 90 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d 89 bd 20 00 f7 d8 89 01 48 83 c8 ff c3 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 69 bd 20 00 f7 d8 89 01 48 83
RSP: 002b:00007ffc1f5d3f88 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fe156599000 RCX: 00007fe1563943a7
RDX: 0000000000000000 RSI: 0000000000200000 RDI: 00007fe156171000
RBP: 00007ffc1f5d42c0 R08: 0000000000000003 R09: 0000000000000000
R10: 00007ffc1f5d3f90 R11: 0000000000000206 R12: 00007ffc1f5d43a8
R13: 0000000000000002 R14: 0000000000000801 R15: 00007ffc1f5d4360

Allocated by task 8245:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 ____kasan_kmalloc mm/kasan/common.c:506 [inline]
 ____kasan_kmalloc mm/kasan/common.c:465 [inline]
 __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
 kmalloc include/linux/slab.h:554 [inline]
 tomoyo_print_header security/tomoyo/audit.c:156 [inline]
 tomoyo_init_log+0x18a/0x1ee0 security/tomoyo/audit.c:255
 tomoyo_supervisor+0x34d/0xf00 security/tomoyo/common.c:2097
 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
 tomoyo_path_number_perm+0x419/0x590 security/tomoyo/file.c:734
 security_file_ioctl+0x50/0xb0 security/security.c:1495
 __do_sys_ioctl fs/ioctl.c:747 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 8245:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0xe5/0x7f0 mm/slub.c:4213
 tomoyo_init_log+0x14f7/0x1ee0 security/tomoyo/audit.c:294
 tomoyo_supervisor+0x34d/0xf00 security/tomoyo/common.c:2097
 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
 tomoyo_path_number_perm+0x419/0x590 security/tomoyo/file.c:734
 security_file_ioctl+0x50/0xb0 security/security.c:1495
 __do_sys_ioctl fs/ioctl.c:747 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88802ad2e000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2048 bytes to the right of
 4096-byte region [ffff88802ad2e000, ffff88802ad2f000)
The buggy address belongs to the page:
page:ffffea0000ab4a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ad28
head:ffffea0000ab4a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88802ad2f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802ad2f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802ad2f800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88802ad2f880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802ad2f900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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