==================================================================
BUG: KASAN: use-after-free in __ptr_ring_peek include/linux/ptr_ring.h:172 [inline]
BUG: KASAN: use-after-free in __ptr_ring_consume include/linux/ptr_ring.h:299 [inline]
BUG: KASAN: use-after-free in veth_xdp_rcv+0x70b/0x810 drivers/net/veth.c:856
Read of size 8 at addr ffff888027f200c0 by task ksoftirqd/1/19

CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 __ptr_ring_peek include/linux/ptr_ring.h:172 [inline]
 __ptr_ring_consume include/linux/ptr_ring.h:299 [inline]
 veth_xdp_rcv+0x70b/0x810 drivers/net/veth.c:856
 veth_poll+0x134/0x850 drivers/net/veth.c:913
 __napi_poll+0xaf/0x440 net/core/dev.c:6993
 napi_poll net/core/dev.c:7060 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:7147
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Allocated by task 4841:
 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:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522
 kmalloc_node include/linux/slab.h:614 [inline]
 kvmalloc_node+0x61/0x120 mm/util.c:587
 kvmalloc include/linux/mm.h:805 [inline]
 kvmalloc_array include/linux/mm.h:823 [inline]
 __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline]
 ptr_ring_init include/linux/ptr_ring.h:489 [inline]
 __veth_napi_enable_range+0xa2/0x780 drivers/net/veth.c:941
 __veth_napi_enable drivers/net/veth.c:964 [inline]
 veth_enable_xdp+0x30f/0x620 drivers/net/veth.c:1068
 veth_xdp_set drivers/net/veth.c:1483 [inline]
 veth_xdp+0x4d4/0x780 drivers/net/veth.c:1523
 dev_xdp_install+0xd5/0x270 net/core/dev.c:9365
 dev_xdp_attach+0x83d/0x1010 net/core/dev.c:9513
 dev_xdp_attach_link net/core/dev.c:9532 [inline]
 bpf_xdp_link_attach+0x262/0x410 net/core/dev.c:9695
 link_create kernel/bpf/syscall.c:4286 [inline]
 __sys_bpf+0x561c/0x5ee0 kernel/bpf/syscall.c:4685
 __do_sys_bpf kernel/bpf/syscall.c:4719 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4717 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4717
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 4831:
 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:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1700 [inline]
 slab_free_freelist_hook+0x81/0x190 mm/slub.c:1725
 slab_free mm/slub.c:3483 [inline]
 kfree+0xe4/0x530 mm/slub.c:4543
 kvfree+0x42/0x50 mm/util.c:620
 ptr_ring_cleanup include/linux/ptr_ring.h:671 [inline]
 veth_napi_del_range+0x3aa/0x560 drivers/net/veth.c:985
 veth_napi_del drivers/net/veth.c:991 [inline]
 veth_disable_xdp+0x2b3/0x430 drivers/net/veth.c:1101
 veth_xdp_set drivers/net/veth.c:1499 [inline]
 veth_xdp+0x698/0x780 drivers/net/veth.c:1523
 dev_xdp_install+0x1ed/0x270 net/core/dev.c:9365
 dev_xdp_detach_link net/core/dev.c:9549 [inline]
 bpf_xdp_link_release+0x242/0x4e0 net/core/dev.c:9564
 bpf_link_free+0xe6/0x1b0 kernel/bpf/syscall.c:2444
 bpf_link_put+0x161/0x1b0 kernel/bpf/syscall.c:2470
 bpf_link_release+0x33/0x40 kernel/bpf/syscall.c:2478
 __fput+0x288/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:2987 [inline]
 call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067
 in6_dev_finish_destroy+0x15e/0x1e0 net/ipv6/addrconf_core.c:271
 in6_dev_put include/net/addrconf.h:378 [inline]
 addrconf_ifdown.isra.0+0x1334/0x1630 net/ipv6/addrconf.c:3868
 addrconf_notify+0xeb/0x1bb0 net/ipv6/addrconf.c:3646
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11050
 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10984
 unregister_netdevice include/linux/netdevice.h:2988 [inline]
 __tun_detach+0x10ad/0x13d0 drivers/net/tun.c:670
 tun_detach drivers/net/tun.c:687 [inline]
 tun_chr_close+0xc4/0x180 drivers/net/tun.c:3397
 __fput+0x288/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888027f20000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 192 bytes inside of
 2048-byte region [ffff888027f20000, ffff888027f20800)
The buggy address belongs to the page:
page:ffffea00009fc800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27f20
head:ffffea00009fc800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c42000
raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 19, ts 2779247281581, free_ts 2779216840052
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2197
 alloc_slab_page mm/slub.c:1763 [inline]
 allocate_slab mm/slub.c:1900 [inline]
 new_slab+0x319/0x490 mm/slub.c:1963
 ___slab_alloc+0x921/0xfe0 mm/slub.c:2994
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3081
 slab_alloc_node mm/slub.c:3172 [inline]
 __kmalloc_node_track_caller+0x2d2/0x340 mm/slub.c:4936
 kmalloc_reserve net/core/skbuff.c:352 [inline]
 __alloc_skb+0xda/0x360 net/core/skbuff.c:424
 alloc_skb include/linux/skbuff.h:1116 [inline]
 ip_frag_next+0x11e/0x9a0 net/ipv4/ip_output.c:686
 ip_do_fragment+0x762/0x1430 net/ipv4/ip_output.c:886
 br_nf_ip_fragment net/bridge/br_netfilter_hooks.c:718 [inline]
 br_nf_dev_queue_xmit+0x11c0/0x1f30 net/bridge/br_netfilter_hooks.c:780
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 br_nf_post_routing+0xf30/0x1b40 net/bridge/br_netfilter_hooks.c:854
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:589
 nf_hook+0x3d4/0x680 include/linux/netfilter.h:262
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_forward_finish+0x7f/0xd0 net/bridge/br_forward.c:66
 br_nf_hook_thresh+0x2a5/0x360 net/bridge/br_netfilter_hooks.c:1025
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3394
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x209/0x390 mm/slub.c:3219
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags+0x9a/0xe0 include/linux/audit.h:319
 user_path_at_empty+0x2b/0x60 fs/namei.c:2800
 do_readlinkat+0xcd/0x2f0 fs/stat.c:443
 __do_sys_readlinkat fs/stat.c:470 [inline]
 __se_sys_readlinkat fs/stat.c:467 [inline]
 __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:467
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff888027f1ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888027f20000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888027f20080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888027f20100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888027f20180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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