================================================================== BUG: KASAN: use-after-free in eth_header_parse_protocol+0xdc/0xe0 net/ethernet/eth.c:283 Read of size 2 at addr ffff8880248d640b by task syz-executor.5/3552 CPU: 1 PID: 3552 Comm: syz-executor.5 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 eth_header_parse_protocol+0xdc/0xe0 net/ethernet/eth.c:283 dev_parse_header_protocol include/linux/netdevice.h:3264 [inline] virtio_net_hdr_to_skb.constprop.0+0x99d/0xcd0 include/linux/virtio_net.h:83 packet_snd net/packet/af_packet.c:2994 [inline] packet_sendmsg+0x233c/0x5300 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f394f3a8188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000080 RSI: 0000000020000440 RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff27eb3aaf R14: 00007f394f3a8300 R15: 0000000000022000 Allocated by task 2844: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc_node include/linux/slab.h:577 [inline] kzalloc_node include/linux/slab.h:695 [inline] qdisc_alloc+0xac/0xb60 net/sched/sch_generic.c:817 qdisc_create_dflt+0x71/0x4b0 net/sched/sch_generic.c:880 mq_init+0x358/0x4b0 net/sched/sch_mq.c:90 qdisc_create_dflt+0x101/0x4b0 net/sched/sch_generic.c:887 attach_default_qdiscs net/sched/sch_generic.c:1050 [inline] dev_activate+0x7f6/0xa60 net/sched/sch_generic.c:1101 __dev_open+0x380/0x4d0 net/core/dev.c:1618 __dev_change_flags+0x583/0x750 net/core/dev.c:8735 dev_change_flags+0x93/0x170 net/core/dev.c:8806 devinet_ioctl+0x15e6/0x1c90 net/ipv4/devinet.c:1142 inet_ioctl+0x1ea/0x330 net/ipv4/af_inet.c:971 packet_ioctl+0xad/0x250 net/packet/af_packet.c:4161 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1039 sock_ioctl+0x477/0x6a0 net/socket.c:1179 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 3468: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4213 skb_free_head net/core/skbuff.c:650 [inline] skb_release_data+0x622/0x750 net/core/skbuff.c:671 skb_release_all net/core/skbuff.c:725 [inline] __kfree_skb net/core/skbuff.c:739 [inline] kfree_skb net/core/skbuff.c:757 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:751 __netif_receive_skb_core+0x821/0x37f0 net/core/dev.c:5410 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5434 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5550 process_backlog+0x232/0x6c0 net/core/dev.c:6413 __napi_poll+0xaf/0x440 net/core/dev.c:6961 napi_poll net/core/dev.c:7028 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7114 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3039 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3114 qdisc_put+0xcd/0xe0 net/sched/sch_generic.c:974 shutdown_scheduler_queue net/sched/sch_generic.c:1313 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2337 [inline] dev_shutdown+0x11b/0x4a0 net/sched/sch_generic.c:1319 unregister_netdevice_many+0x809/0x1780 net/core/dev.c:10993 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10934 unregister_netdevice include/linux/netdevice.h:2969 [inline] __tun_detach+0x105a/0x13d0 drivers/net/tun.c:662 tun_detach drivers/net/tun.c:679 [inline] tun_chr_close+0xd9/0x180 drivers/net/tun.c:3350 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3039 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3114 put_event kernel/events/core.c:4957 [inline] perf_event_release_kernel+0xa24/0xe00 kernel/events/core.c:5072 perf_release+0x33/0x40 kernel/events/core.c:5082 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880248d6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1035 bytes inside of 2048-byte region [ffff8880248d6000, ffff8880248d6800) The buggy address belongs to the page: page:ffffea0000923400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x248d0 head:ffffea0000923400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000500000001 ffff888010842000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880248d6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880248d6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880248d6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880248d6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880248d6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================