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BUG: KASAN: slab-use-after-free in __xsk_map_flush+0x2f9/0x310 net/xdp/xsk.c:392
Read of size 8 at addr ffff888022006c10 by task syz.0.390/6755

CPU: 1 PID: 6755 Comm: syz.0.390 Not tainted 6.10.0-syzkaller-09703-gd7e78951a8b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 __xsk_map_flush+0x2f9/0x310 net/xdp/xsk.c:392
 xdp_do_check_flushed+0x175/0x4e0 net/core/filter.c:4308
 __napi_poll.constprop.0+0xd1/0x550 net/core/dev.c:6774
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0xa92/0x1010 net/core/dev.c:6962
 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
 do_softirq kernel/softirq.c:455 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:442
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_rx_batched+0x43a/0x780 drivers/net/tun.c:1574
 tun_get_user+0x2a5c/0x3c30 drivers/net/tun.c:2006
 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2052
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8953746df
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 8c 02 00 48
RSP: 002b:00007ff896147010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff895505f60 RCX: 00007ff8953746df
RDX: 000000000000004e RSI: 0000000020000200 RDI: 00000000000000c8
RBP: 00007ff8953e4e5d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000004e R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff895505f60 R15: 00007ffef8f5fa48
 </TASK>

Allocated by task 6755:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_mempool_unpoison_object+0x193/0x1d0 mm/kasan/common.c:535
 kasan_mempool_unpoison_object include/linux/kasan.h:339 [inline]
 napi_skb_cache_get+0x327/0x890 net/core/skbuff.c:363
 __napi_build_skb+0x14/0x50 net/core/skbuff.c:533
 napi_build_skb+0x22/0x280 net/core/skbuff.c:555
 skb_pp_cow_data+0x2de/0xc00 net/core/skbuff.c:950
 skb_cow_data_for_xdp+0x88/0xb0 net/core/skbuff.c:1013
 netif_skb_check_for_xdp net/core/dev.c:5030 [inline]
 netif_receive_generic_xdp net/core/dev.c:5069 [inline]
 do_xdp_generic+0x3fc/0xd70 net/core/dev.c:5137
 __netif_receive_skb_core.constprop.0+0x12f7/0x4330 net/core/dev.c:5480
 __netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5658
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5774
 netif_receive_skb_internal net/core/dev.c:5860 [inline]
 netif_receive_skb+0x13f/0x7b0 net/core/dev.c:5920
 tun_rx_batched+0x429/0x780 drivers/net/tun.c:1573
 tun_get_user+0x2a5c/0x3c30 drivers/net/tun.c:2006
 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2052
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6755:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2235 [inline]
 slab_free mm/slub.c:4464 [inline]
 kmem_cache_free+0x12f/0x3a0 mm/slub.c:4539
 kfree_skbmem+0x10e/0x200 net/core/skbuff.c:1146
 __kfree_skb net/core/skbuff.c:1203 [inline]
 sk_skb_reason_drop+0x140/0x210 net/core/skbuff.c:1240
 tcp_v6_rcv+0xea8/0x4120 net/ipv6/tcp_ipv6.c:1943
 ip6_protocol_deliver_rcu+0x188/0x1530 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x14f/0x2f0 net/ipv6/ip6_input.c:483
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip6_input+0xa1/0xd0 net/ipv6/ip6_input.c:492
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ipv6_rcv+0x265/0x680 net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5660
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5774
 netif_receive_skb_internal net/core/dev.c:5860 [inline]
 netif_receive_skb+0x13f/0x7b0 net/core/dev.c:5920
 tun_rx_batched+0x429/0x780 drivers/net/tun.c:1573
 tun_get_user+0x2a5c/0x3c30 drivers/net/tun.c:2006
 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2052
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888022006b40
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 208 bytes inside of
 freed 240-byte region [ffff888022006b40, ffff888022006c30)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22006
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000000 ffff88801969d780 ffffea0001af7480 dead000000000003
raw: 0000000000000000 00000000000c000c 00000001ffffefff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6213, tgid 6213 (syz-executor), ts 194251013380, free_ts 194187425834
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x56/0x110 mm/slub.c:2304
 allocate_slab mm/slub.c:2467 [inline]
 new_slab+0x84/0x260 mm/slub.c:2520
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3706
 __kmem_cache_alloc_bulk mm/slub.c:4750 [inline]
 kmem_cache_alloc_bulk_noprof+0x257/0x930 mm/slub.c:4822
 napi_skb_cache_get+0x51a/0x890 net/core/skbuff.c:351
 __napi_build_skb+0x14/0x50 net/core/skbuff.c:533
 napi_alloc_skb+0x43e/0xac0 net/core/skbuff.c:856
 napi_get_frags net/core/gro.c:680 [inline]
 napi_get_frags+0x61/0x140 net/core/gro.c:675
 napi_get_frags_check+0x2e/0xb0 net/core/skbuff.c:303
 netif_napi_add_weight+0x538/0xab0 net/core/dev.c:6668
 netif_napi_add include/linux/netdevice.h:2647 [inline]
 gro_cells_init net/core/gro_cells.c:85 [inline]
 gro_cells_init+0x193/0x2f0 net/core/gro_cells.c:70
 ip_tunnel_init+0x105/0x640 net/ipv4/ip_tunnel.c:1321
 ipgre_tunnel_init+0x167/0x480 net/ipv4/ip_gre.c:1046
page last free pid 6213 tgid 6213 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588
 __put_partials+0x14c/0x170 mm/slub.c:3034
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3979 [inline]
 slab_alloc_node mm/slub.c:4028 [inline]
 kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4035
 vm_area_alloc+0x1f/0x230 kernel/fork.c:469
 mmap_region+0x3a5/0x2760 mm/mmap.c:2873
 do_mmap+0xbc7/0xf60 mm/mmap.c:1397
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588
 ksys_mmap_pgoff+0x7d/0x5d0 mm/mmap.c:1443
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888022006b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff888022006b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888022006c00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff888022006c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022006d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
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