device bridge2 entered promiscuous mode device bridge2 entered promiscuous mode team0: Port device vlan3 added device bridge5 entered promiscuous mode ================================================================== BUG: KASAN: use-after-free in br_dev_xmit+0x12b3/0x13e0 net/bridge/br_device.c:68 Read of size 2 at addr ffff8880b395a54e by task syz-executor.1/9866 CPU: 0 PID: 9866 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443 br_dev_xmit+0x12b3/0x13e0 net/bridge/br_device.c:68 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 vlan_dev_hard_start_xmit+0x38f/0x800 net/8021q/vlan_dev.c:131 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 neigh_connected_output+0x3e8/0x5e0 net/core/neighbour.c:1403 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120 ip6_finish_output+0x89b/0x10f0 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:455 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] mld_sendpack+0x674/0x1060 net/ipv6/mcast.c:1681 mld_send_cr net/ipv6/mcast.c:1977 [inline] mld_ifc_timer_expire+0x616/0xdf0 net/ipv6/mcast.c:2476 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:page_remove_file_rmap+0x72/0xa30 mm/rmap.c:1247 Code: ff 85 db 74 33 e8 6e d4 d2 ff 49 8d 7e 54 be 04 00 00 00 e8 e0 9d 08 00 f0 41 ff 4e 54 e8 56 d4 d2 ff 4c 89 f7 48 83 c4 08 5b <5d> 41 5c 41 5d 41 5e 41 5f e9 e0 14 0f 00 e8 3b d4 d2 ff 49 8d 7e RSP: 0018:ffff88809f31f9c8 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13 RAX: ffff88809600a0c0 RBX: 0000000000000000 RCX: ffffffff818fb155 RDX: 0000000000000000 RSI: ffffffff818fb11a RDI: ffffea0001e24500 RBP: ffffea0001e24500 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffea0001e24500 R15: 00007ff9d31fe000 page_remove_rmap+0xe5/0x120 mm/rmap.c:1297 zap_pte_range mm/memory.c:1350 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0x147d/0x2c50 mm/memory.c:1534 unmap_single_vma+0x198/0x300 mm/memory.c:1579 unmap_vmas+0xa9/0x180 mm/memory.c:1609 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff9d41030d9 Code: Bad RIP value. RSP: 002b:00007fffe5962d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007ff9d41030d9 RDX: 00007ff9d40b4f8b RSI: ffffffffffffffb8 RDI: 0000000000000000 RBP: 0000000000000001 R08: 00000000ee5a3a10 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fffe5962e00 Allocated by task 9866: __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] alloc_skb_with_frags+0x92/0x570 net/core/skbuff.c:5333 sock_alloc_send_pskb+0x6e1/0x830 net/core/sock.c:2108 mld_newpack+0x1d2/0x760 net/ipv6/mcast.c:1609 add_grhead+0x265/0x330 net/ipv6/mcast.c:1712 add_grec+0xe3c/0x10b0 net/ipv6/mcast.c:1843 mld_send_cr net/ipv6/mcast.c:1969 [inline] mld_ifc_timer_expire+0x5a2/0xdf0 net/ipv6/mcast.c:2476 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 Freed by task 9866: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 skb_free_head net/core/skbuff.c:563 [inline] pskb_expand_head+0x327/0xf20 net/core/skbuff.c:1506 __skb_cow include/linux/skbuff.h:2977 [inline] skb_cow_head include/linux/skbuff.h:3011 [inline] __vlan_insert_inner_tag include/linux/if_vlan.h:346 [inline] vlan_insert_inner_tag include/linux/if_vlan.h:416 [inline] vlan_insert_tag include/linux/if_vlan.h:441 [inline] vlan_insert_tag_set_proto include/linux/if_vlan.h:460 [inline] __allowed_ingress net/bridge/br_vlan.c:437 [inline] br_allowed_ingress+0x376/0xed0 net/bridge/br_vlan.c:514 br_dev_xmit+0x3e5/0x13e0 net/bridge/br_device.c:64 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 vlan_dev_hard_start_xmit+0x38f/0x800 net/8021q/vlan_dev.c:131 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 neigh_connected_output+0x3e8/0x5e0 net/core/neighbour.c:1403 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120 ip6_finish_output+0x89b/0x10f0 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:455 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] mld_sendpack+0x674/0x1060 net/ipv6/mcast.c:1681 mld_send_cr net/ipv6/mcast.c:1977 [inline] mld_ifc_timer_expire+0x616/0xdf0 net/ipv6/mcast.c:2476 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 The buggy address belongs to the object at ffff8880b395a540 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 14 bytes inside of 2048-byte region [ffff8880b395a540, ffff8880b395ad40) The buggy address belongs to the page: page:ffffea0002ce5680 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0002ce5608 ffffea0002ce1a08 ffff88813bff0c40 raw: 0000000000000000 ffff8880b395a540 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b395a400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880b395a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880b395a500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880b395a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b395a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 85 db test %ebx,%ebx 2: 74 33 je 0x37 4: e8 6e d4 d2 ff callq 0xffd2d477 9: 49 8d 7e 54 lea 0x54(%r14),%rdi d: be 04 00 00 00 mov $0x4,%esi 12: e8 e0 9d 08 00 callq 0x89df7 17: f0 41 ff 4e 54 lock decl 0x54(%r14) 1c: e8 56 d4 d2 ff callq 0xffd2d477 21: 4c 89 f7 mov %r14,%rdi 24: 48 83 c4 08 add $0x8,%rsp 28: 5b pop %rbx * 29: 5d pop %rbp <-- trapping instruction 2a: 41 5c pop %r12 2c: 41 5d pop %r13 2e: 41 5e pop %r14 30: 41 5f pop %r15 32: e9 e0 14 0f 00 jmpq 0xf1517 37: e8 3b d4 d2 ff callq 0xffd2d477 3c: 49 rex.WB 3d: 8d .byte 0x8d 3e: 7e .byte 0x7e