==================================================================
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 ffff88801524f800 by task systemd-udevd/8249

CPU: 0 PID: 8249 Comm: systemd-udevd 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:lock_acquire+0xdf/0x740 kernel/locking/lockdep.c:5484
Code: 6b 5e 00 48 8b 54 24 08 48 0f a3 15 b3 5e 6c 0c 0f 82 ac 04 00 00 48 c7 c0 4c 3d c6 8d 48 ba 00 00 00 00 00 fc ff df 48 89 c1 <83> e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffffc9000c7477a8 EFLAGS: 00000286
RAX: ffffffff8dc63d4c RBX: 1ffff920018e8ef7 RCX: ffffffff8dc63d4c
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8dc60c4f
R10: fffffbfff1b8c189 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880145f5778 R14: 0000000000000000 R15: 0000000000000000
 down_write+0x92/0x150 kernel/locking/rwsem.c:1406
 lock_anon_vma_root mm/rmap.c:245 [inline]
 unlink_anon_vmas+0x1fc/0x860 mm/rmap.c:401
 free_pgtables+0x1ab/0x2f0 mm/memory.c:427
 exit_mmap+0x2b7/0x590 mm/mmap.c:3219
 __mmput+0x122/0x470 kernel/fork.c:1092
 mmput+0x58/0x60 kernel/fork.c:1113
 exec_mmap fs/exec.c:1031 [inline]
 begin_new_exec+0xea7/0x2c40 fs/exec.c:1287
 load_elf_binary+0x159d/0x4b40 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1720 [inline]
 exec_binprm fs/exec.c:1761 [inline]
 bprm_execve fs/exec.c:1830 [inline]
 bprm_execve+0x821/0x19a0 fs/exec.c:1792
 do_execveat_common+0x626/0x7c0 fs/exec.c:1919
 do_execve fs/exec.c:1987 [inline]
 __do_sys_execve fs/exec.c:2063 [inline]
 __se_sys_execve fs/exec.c:2058 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:2058
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fdd256eb647
Code: Unable to access opcode bytes at RIP 0x7fdd256eb61d.
RSP: 002b:00007ffdc5de31c8 EFLAGS: 00000207 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007ffdc5de3710 RCX: 00007fdd256eb647
RDX: 0000564514541780 RSI: 00007ffdc5de3710 RDI: 00007ffdc5de3b10
RBP: 000000000000000f R08: 000000000000fec0 R09: 0000000000000070
R10: 0000000000000008 R11: 0000000000000207 R12: 00007ffdc5de3290
R13: 0000000000000012 R14: 0000564514541780 R15: 00007ffdc5de4ce0

Allocated by task 8243:
 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_slab_alloc+0x75/0x90 mm/kasan/common.c:460
 kasan_slab_alloc include/linux/kasan.h:223 [inline]
 slab_post_alloc_hook mm/slab.h:516 [inline]
 slab_alloc_node mm/slub.c:2907 [inline]
 slab_alloc mm/slub.c:2915 [inline]
 kmem_cache_alloc+0x155/0x370 mm/slub.c:2920
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags include/linux/audit.h:319 [inline]
 getname+0x8e/0xd0 fs/namei.c:209
 do_sys_openat2+0xf5/0x420 fs/open.c:1181
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1207
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 8243:
 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]
 kmem_cache_free+0x8a/0x740 mm/slub.c:3177
 putname+0xe1/0x120 fs/namei.c:259
 do_sys_openat2+0x153/0x420 fs/open.c:1196
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1207
 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 ffff88801524e600
 which belongs to the cache names_cache of size 4096
The buggy address is located 512 bytes to the right of
 4096-byte region [ffff88801524e600, ffff88801524f600)
The buggy address belongs to the page:
page:ffffea0000549200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15248
head:ffffea0000549200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff8880109bd140
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88801524f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801524f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801524f800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801524f880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801524f900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
CPU: 0 PID: 8249 Comm: systemd-udevd Tainted: G    B             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
 panic+0x306/0x73d kernel/panic.c:231
 end_report mm/kasan/report.c:102 [inline]
 end_report.cold+0x5a/0x5a mm/kasan/report.c:88
 __kasan_report mm/kasan/report.c:406 [inline]
 kasan_report.cold+0x6a/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:lock_acquire+0xdf/0x740 kernel/locking/lockdep.c:5484
Code: 6b 5e 00 48 8b 54 24 08 48 0f a3 15 b3 5e 6c 0c 0f 82 ac 04 00 00 48 c7 c0 4c 3d c6 8d 48 ba 00 00 00 00 00 fc ff df 48 89 c1 <83> e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffffc9000c7477a8 EFLAGS: 00000286
RAX: ffffffff8dc63d4c RBX: 1ffff920018e8ef7 RCX: ffffffff8dc63d4c
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8dc60c4f
R10: fffffbfff1b8c189 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880145f5778 R14: 0000000000000000 R15: 0000000000000000
 down_write+0x92/0x150 kernel/locking/rwsem.c:1406
 lock_anon_vma_root mm/rmap.c:245 [inline]
 unlink_anon_vmas+0x1fc/0x860 mm/rmap.c:401
 free_pgtables+0x1ab/0x2f0 mm/memory.c:427
 exit_mmap+0x2b7/0x590 mm/mmap.c:3219
 __mmput+0x122/0x470 kernel/fork.c:1092
 mmput+0x58/0x60 kernel/fork.c:1113
 exec_mmap fs/exec.c:1031 [inline]
 begin_new_exec+0xea7/0x2c40 fs/exec.c:1287
 load_elf_binary+0x159d/0x4b40 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1720 [inline]
 exec_binprm fs/exec.c:1761 [inline]
 bprm_execve fs/exec.c:1830 [inline]
 bprm_execve+0x821/0x19a0 fs/exec.c:1792
 do_execveat_common+0x626/0x7c0 fs/exec.c:1919
 do_execve fs/exec.c:1987 [inline]
 __do_sys_execve fs/exec.c:2063 [inline]
 __se_sys_execve fs/exec.c:2058 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:2058
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fdd256eb647
Code: Unable to access opcode bytes at RIP 0x7fdd256eb61d.
RSP: 002b:00007ffdc5de31c8 EFLAGS: 00000207 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007ffdc5de3710 RCX: 00007fdd256eb647
RDX: 0000564514541780 RSI: 00007ffdc5de3710 RDI: 00007ffdc5de3b10
RBP: 000000000000000f R08: 000000000000fec0 R09: 0000000000000070
R10: 0000000000000008 R11: 0000000000000207 R12: 00007ffdc5de3290
R13: 0000000000000012 R14: 0000564514541780 R15: 00007ffdc5de4ce0
Kernel Offset: disabled
Rebooting in 86400 seconds..