syzbot

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BUG: KASAN: use-after-free in skb_zcopy include/linux/skbuff.h:1674 [inline]
BUG: KASAN: use-after-free in skb_orphan_frags_rx include/linux/skbuff.h:3162 [inline]
BUG: KASAN: use-after-free in __netif_receive_skb_core+0x3b56/0x43d0 net/core/dev.c:5519
Read of size 1 at addr ffff8881158b5080 by task syz-executor/297

CPU: 0 PID: 297 Comm: syz-executor Not tainted 6.1.129-syzkaller-00020-g70d648657b1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348
 skb_zcopy include/linux/skbuff.h:1674 [inline]
 skb_orphan_frags_rx include/linux/skbuff.h:3162 [inline]
 __netif_receive_skb_core+0x3b56/0x43d0 net/core/dev.c:5519
 __netif_receive_skb_one_core net/core/dev.c:5552 [inline]
 __netif_receive_skb+0x11c/0x530 net/core/dev.c:5668
 netif_receive_skb_internal net/core/dev.c:5754 [inline]
 netif_receive_skb+0xb0/0x480 net/core/dev.c:5813
 br_netif_receive_skb net/bridge/br_input.c:30 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_pass_frame_up+0x223/0x480 net/bridge/br_input.c:70
 br_handle_frame_finish+0x12a4/0x1660 net/bridge/br_input.c:-1
 nf_hook_bridge_pre net/bridge/br_input.c:282 [inline]
 br_handle_frame+0x984/0x1070 net/bridge/br_input.c:406
 __netif_receive_skb_core+0x1264/0x43d0 net/core/dev.c:5448
 __netif_receive_skb_one_core net/core/dev.c:5552 [inline]
 __netif_receive_skb+0x11c/0x530 net/core/dev.c:5668
 process_backlog+0x32c/0x630 net/core/dev.c:5996
 __napi_poll+0xbe/0x5c0 net/core/dev.c:6563
 napi_poll net/core/dev.c:6630 [inline]
 net_rx_action+0x595/0xdd0 net/core/dev.c:6744
 handle_softirqs+0x1db/0x650 kernel/softirq.c:624
 __do_softirq+0xb/0xd kernel/softirq.c:662
 do_softirq+0xf6/0x150 kernel/softirq.c:506
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:430
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x50/0x60 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 release_sock net/core/sock.c:3530 [inline]
 sockopt_release_sock+0x198/0x1f0 net/core/sock.c:1067
 do_ip_getsockopt+0x508/0x23c0 net/ipv4/ip_sockglue.c:1776
 ip_getsockopt+0xe9/0x290 net/ipv4/ip_sockglue.c:1809
 tcp_getsockopt+0x15c/0x1c0 net/ipv4/tcp.c:4434
 sock_common_getsockopt+0x99/0xb0 net/core/sock.c:3671
 __sys_getsockopt+0x21f/0x490 net/socket.c:2322
 __do_sys_getsockopt net/socket.c:2337 [inline]
 __se_sys_getsockopt net/socket.c:2334 [inline]
 __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2334
 x64_sys_call+0x1a9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f50221906aa
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffd89e2af28 EFLAGS: 00000216 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffd89e2afb0 RCX: 00007f50221906aa
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffd89e2af4c R09: 0079746972756365
R10: 00007ffd89e2afb0 R11: 0000000000000216 R12: 00007f5022382940
R13: 00007ffd89e2af4c R14: 0000000000000000 R15: 00007f5022383000
 </TASK>

Allocated by task 0:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb3/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x125/0x2d0 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1290 [inline]
 ndisc_alloc_skb net/ipv6/ndisc.c:423 [inline]
 ndisc_send_rs+0x291/0x800 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x2d1/0x600 net/ipv6/addrconf.c:4004
 call_timer_fn+0x3b/0x2d0 kernel/time/timer.c:1510
 expire_timers kernel/time/timer.c:1555 [inline]
 __run_timers+0x72a/0xa10 kernel/time/timer.c:1826
 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1839
 handle_softirqs+0x1db/0x650 kernel/softirq.c:624
 __do_softirq kernel/softirq.c:662 [inline]
 invoke_softirq kernel/softirq.c:479 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:711
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:723
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691

Freed by task 297:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1745 [inline]
 slab_free_freelist_hook mm/slub.c:1771 [inline]
 slab_free mm/slub.c:3686 [inline]
 __kmem_cache_free+0x21d/0x410 mm/slub.c:3702
 kfree+0x7a/0xf0 mm/slab_common.c:990
 skb_free_head net/core/skbuff.c:762 [inline]
 pskb_expand_head+0x417/0x1380 net/core/skbuff.c:1880
 __skb_cow include/linux/skbuff.h:3604 [inline]
 skb_cow_head include/linux/skbuff.h:3638 [inline]
 __vlan_insert_inner_tag include/linux/if_vlan.h:354 [inline]
 vlan_insert_inner_tag include/linux/if_vlan.h:424 [inline]
 vlan_insert_tag include/linux/if_vlan.h:449 [inline]
 vlan_insert_tag_set_proto include/linux/if_vlan.h:468 [inline]
 __vlan_hwaccel_push_inside include/linux/if_vlan.h:510 [inline]
 validate_xmit_vlan net/core/dev.c:3677 [inline]
 validate_xmit_skb+0x829/0xd30 net/core/dev.c:3714
 __dev_queue_xmit+0x160c/0x3730 net/core/dev.c:4306
 dev_queue_xmit include/linux/netdevice.h:3082 [inline]
 vlan_dev_hard_start_xmit+0x316/0x560 net/8021q/vlan_dev.c:124
 __netdev_start_xmit include/linux/netdevice.h:4927 [inline]
 netdev_start_xmit include/linux/netdevice.h:4941 [inline]
 xmit_one net/core/dev.c:3638 [inline]
 dev_hard_start_xmit+0x1fa/0x770 net/core/dev.c:3654
 __dev_queue_xmit+0x1885/0x3730 net/core/dev.c:4314
 dev_queue_xmit include/linux/netdevice.h:3082 [inline]
 br_dev_queue_push_xmit+0x595/0x730 net/bridge/br_forward.c:53
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_forward_finish+0x136/0x360 net/bridge/br_forward.c:66
 NF_HOOK include/linux/netfilter.h:305 [inline]
 __br_forward+0x473/0x5b0 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 br_flood+0x39d/0x420 net/bridge/br_forward.c:240
 br_handle_frame_finish+0x1276/0x1660 net/bridge/br_input.c:198
 nf_hook_bridge_pre net/bridge/br_input.c:282 [inline]
 br_handle_frame+0x984/0x1070 net/bridge/br_input.c:406
 __netif_receive_skb_core+0x1264/0x43d0 net/core/dev.c:5448
 __netif_receive_skb_one_core net/core/dev.c:5552 [inline]
 __netif_receive_skb+0x11c/0x530 net/core/dev.c:5668
 process_backlog+0x32c/0x630 net/core/dev.c:5996
 __napi_poll+0xbe/0x5c0 net/core/dev.c:6563
 napi_poll net/core/dev.c:6630 [inline]
 net_rx_action+0x595/0xdd0 net/core/dev.c:6744
 handle_softirqs+0x1db/0x650 kernel/softirq.c:624
 __do_softirq+0xb/0xd kernel/softirq.c:662

The buggy address belongs to the object at ffff8881158b5000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 128 bytes inside of
 512-byte region [ffff8881158b5000, ffff8881158b5200)

The buggy address belongs to the physical page:
page:ffffea0004562d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1158b4
head:ffffea0004562d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00050cab00 dead000000000002 ffff888100042f00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 15952, tgid 15944 (syz.5.3404), ts 1577453919180, free_ts 1447122572318
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2637
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2644
 get_page_from_freelist+0x3a98/0x3b10 mm/page_alloc.c:4539
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5837
 alloc_slab_page+0x6c/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x90/0x3e0 mm/slub.c:2015
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
 __slab_alloc+0x5d/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x207/0x2a0 mm/slub.c:3462
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa2/0x1e0 mm/slab_common.c:958
 kmemdup+0x29/0x60 mm/util.c:134
 _Z7kmemdupPKvU17pass_object_size0mj include/linux/fortify-string.h:585 [inline]
 scm_fp_dup+0x5d/0x2d0 net/core/scm.c:367
 unix_peek_fds net/unix/af_unix.c:1733 [inline]
 __unix_dgram_recvmsg+0xb75/0x12b0 net/unix/af_unix.c:2502
 unix_dgram_recvmsg net/unix/af_unix.c:2526 [inline]
 unix_seqpacket_recvmsg+0xef/0x120 net/unix/af_unix.c:2395
 ____sys_recvmsg+0x285/0x530 net/socket.c:-1
 ___sys_recvmsg net/socket.c:2770 [inline]
 do_recvmmsg+0x46d/0xab0 net/socket.c:2864
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1545 [inline]
 free_pcp_prepare mm/page_alloc.c:1619 [inline]
 free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3581
 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3677
 free_the_page mm/page_alloc.c:830 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5926
 __vunmap+0x9c6/0xb80 mm/vmalloc.c:2729
 __vfree mm/vmalloc.c:2778 [inline]
 vfree+0x5c/0x80 mm/vmalloc.c:2809
 htable_put+0x5be/0x610 net/netfilter/xt_hashlimit.c:432
 hashlimit_mt_destroy_v1+0x58/0x60 net/netfilter/xt_hashlimit.c:970
 cleanup_match net/ipv4/netfilter/ip_tables.c:461 [inline]
 find_check_entry net/ipv4/netfilter/ip_tables.c:565 [inline]
 translate_table+0x1c39/0x2350 net/ipv4/netfilter/ip_tables.c:718
 do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline]
 do_ipt_set_ctl+0xb3f/0x1160 net/ipv4/netfilter/ip_tables.c:1637
 nf_setsockopt+0x274/0x2a0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0xe0/0x100 net/ipv4/ip_sockglue.c:1468
 udp_setsockopt+0x8f/0xa0 net/ipv4/udp.c:2782
 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3698
 __sys_setsockopt+0x46e/0x840 net/socket.c:2278
 __do_sys_setsockopt net/socket.c:2289 [inline]
 __se_sys_setsockopt net/socket.c:2286 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2286
 x64_sys_call+0x1a2/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55

Memory state around the buggy address:
 ffff8881158b4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881158b5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881158b5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881158b5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881158b5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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