syz.2.17 uses obsolete (PF_INET,SOCK_PACKET)
==================================================================
BUG: KASAN: slab-use-after-free in skb_reset_mac_header include/linux/skbuff.h:2933 [inline]
BUG: KASAN: slab-use-after-free in napi_frags_skb net/core/gro.c:700 [inline]
BUG: KASAN: slab-use-after-free in napi_gro_frags+0x68/0xc30 net/core/gro.c:732
Read of size 8 at addr ffff8881148605c8 by task syz.2.17/3222

CPU: 0 PID: 3222 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xcf/0x140 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xca/0x250 mm/kasan/report.c:488
 kasan_report+0x117/0x150 mm/kasan/report.c:601
 skb_reset_mac_header include/linux/skbuff.h:2933 [inline]
 napi_frags_skb net/core/gro.c:700 [inline]
 napi_gro_frags+0x68/0xc30 net/core/gro.c:732
 tun_get_user+0x1d1c/0x2bc0 drivers/net/tun.c:1977
 tun_chr_write_iter+0xc3/0x190 drivers/net/tun.c:2053
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x593/0xc10 fs/read_write.c:590
 ksys_write+0xf2/0x1a0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f8f5df11be9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f5dd82038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8f5e148fa0 RCX: 00007f8f5df11be9
RDX: 000000000000004b RSI: 0000200000000340 RDI: 0000000000000003
RBP: 00007f8f5df94e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8f5e149038 R14: 00007f8f5e148fa0 R15: 00007ffe5eababe8
 </TASK>

Allocated by task 3222:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:314 [inline]
 __kasan_mempool_unpoison_object+0xad/0x1c0 mm/kasan/common.c:537
 kasan_mempool_unpoison_object include/linux/kasan.h:339 [inline]
 napi_skb_cache_get net/core/skbuff.c:340 [inline]
 __napi_build_skb+0xc8/0x190 net/core/skbuff.c:510
 __napi_alloc_skb+0x311/0x490 net/core/skbuff.c:829
 napi_alloc_skb include/linux/skbuff.h:3292 [inline]
 napi_get_frags+0x61/0x130 net/core/gro.c:650
 tun_napi_alloc_frags drivers/net/tun.c:1473 [inline]
 tun_get_user+0x77a/0x2bc0 drivers/net/tun.c:1841
 tun_chr_write_iter+0xc3/0x190 drivers/net/tun.c:2053
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x593/0xc10 fs/read_write.c:590
 ksys_write+0xf2/0x1a0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

Freed by task 3222:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x54/0x70 mm/kasan/generic.c:640
 poison_slab_object+0xfb/0x1c0 mm/kasan/common.c:241
 __kasan_slab_free+0x3d/0x70 mm/kasan/common.c:257
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2121 [inline]
 slab_free mm/slub.c:4299 [inline]
 kmem_cache_free+0x12b/0x310 mm/slub.c:4363
 skb_pp_cow_data net/core/skbuff.c:970 [inline]
 skb_cow_data_for_xdp+0xc60/0x11f0 net/core/skbuff.c:985
 netif_skb_check_for_xdp net/core/dev.c:4959 [inline]
 netif_receive_generic_xdp net/core/dev.c:4998 [inline]
 do_xdp_generic+0x274/0x960 net/core/dev.c:5063
 tun_get_user+0x1ad5/0x2bc0 drivers/net/tun.c:1929
 tun_chr_write_iter+0xc3/0x190 drivers/net/tun.c:2053
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x593/0xc10 fs/read_write.c:590
 ksys_write+0xf2/0x1a0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77

The buggy address belongs to the object at ffff888114860500
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 200 bytes inside of
 freed 224-byte region [ffff888114860500, ffff8881148605e0)

The buggy address belongs to the physical page:
page:ffffea0004521800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114860
flags: 0x200000000000800(slab|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000000800 ffff8881026c03c0 ffffea000449e540 dead000000000002
raw: 0000000000000000 00000000000c000c 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1971, tgid 1971 (udevadm), ts 5914911784, free_ts 0
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x16e/0x1b0 mm/page_alloc.c:1533
 prep_new_page mm/page_alloc.c:1540 [inline]
 get_page_from_freelist+0x2eaa/0x3000 mm/page_alloc.c:3311
 __alloc_pages+0x1d2/0x400 mm/page_alloc.c:4567
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x46/0x140 mm/slub.c:2190
 allocate_slab mm/slub.c:2354 [inline]
 new_slab+0x70/0x270 mm/slub.c:2407
 ___slab_alloc+0xa70/0x1020 mm/slub.c:3540
 __slab_alloc mm/slub.c:3625 [inline]
 __slab_alloc_node mm/slub.c:3678 [inline]
 slab_alloc_node mm/slub.c:3850 [inline]
 kmem_cache_alloc+0x21c/0x360 mm/slub.c:3867
 skb_clone+0x19f/0x330 net/core/skbuff.c:2046
 do_one_broadcast net/netlink/af_netlink.c:1472 [inline]
 netlink_broadcast_filtered+0x560/0xdf0 net/netlink/af_netlink.c:1550
 netlink_broadcast+0xe/0x20 net/netlink/af_netlink.c:1574
 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
 kobject_uevent_net_broadcast+0x30c/0x3f0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x567/0x700 lib/kobject_uevent.c:593
 kobject_synth_uevent+0x741/0x8d0 lib/kobject_uevent.c:208
 uevent_store+0x46/0x60 drivers/base/bus.c:633
 kernfs_fop_write_iter+0x29c/0x3d0 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x593/0xc10 fs/read_write.c:590
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888114860480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888114860500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888114860580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                              ^
 ffff888114860600: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff888114860680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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