batman_adv: batadv0: The MTU of interface vlan4 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
batman_adv: batadv0: Not using interface vlan4 (retrying later): interface not active
==================================================================
BUG: KASAN: use-after-free in br_dev_xmit+0x12b3/0x13e0 net/bridge/br_device.c:68
Read of size 2 at addr ffff8880983392ce by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/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:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 48 89 df e8 f4 20 7f f9 e9 2e ff ff ff 48 89 df e8 e7 20 7f f9 eb 82 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 14 43 4e 00 fb f4 90 e9 07 00 00 00 0f 00 2d 04 43 4e 00 f4 c3 90 90 41 56 41 55
RSP: 0018:ffff8880b5a9fd40 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13e3054 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880b5a86c44
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f18290
R13: 1ffff11016b53fb2 R14: 0000000000000000 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x49/0x310 arch/x86/kernel/process.c:557
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x2ec/0x4b0 kernel/sched/idle.c:263
cpu_startup_entry+0xc5/0xe0 kernel/sched/idle.c:369
start_secondary+0x435/0x5c0 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Allocated by task 0:
__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 0:
__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 ffff8880983392c0
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 14 bytes inside of
2048-byte region [ffff8880983392c0, ffff888098339ac0)
The buggy address belongs to the page:
page:ffffea000260ce00 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0002448508 ffffea0002d35a88 ffff88813bff0c40
raw: 0000000000000000 ffff8880983381c0 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888098339180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888098339200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888098339280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff888098339300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888098339380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 48 89 df mov %rbx,%rdi
3: e8 f4 20 7f f9 callq 0xf97f20fc
8: e9 2e ff ff ff jmpq 0xffffff3b
d: 48 89 df mov %rbx,%rdi
10: e8 e7 20 7f f9 callq 0xf97f20fc
15: eb 82 jmp 0xffffff99
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: e9 07 00 00 00 jmpq 0x28
21: 0f 00 2d 14 43 4e 00 verw 0x4e4314(%rip) # 0x4e433c
28: fb sti
29: f4 hlt
* 2a: c3 retq <-- trapping instruction
2b: 90 nop
2c: e9 07 00 00 00 jmpq 0x38
31: 0f 00 2d 04 43 4e 00 verw 0x4e4304(%rip) # 0x4e433c
38: f4 hlt
39: c3 retq
3a: 90 nop
3b: 90 nop
3c: 41 56 push %r14
3e: 41 55 push %r13