================================================================== BUG: KASAN: slab-out-of-bounds in eth_header_parse_protocol+0xdc/0xe0 net/ethernet/eth.c:283 Read of size 2 at addr ffff8880130dc80b by task syz-executor.1/5871 CPU: 1 PID: 5871 Comm: syz-executor.1 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:00007ff9106cd188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000080 RSI: 0000000020000440 RDI: 0000000000000004 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcfccf6bdf R14: 00007ff9106cd300 R15: 0000000000022000 Allocated by task 15002: 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 include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:684 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1323 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2571 devinet_sysctl_register net/ipv4/devinet.c:2611 [inline] devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2601 inetdev_init+0x25d/0x550 net/ipv4/devinet.c:276 inetdev_event+0xa4f/0x15c0 net/ipv4/devinet.c:1530 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] register_netdevice+0x106b/0x1500 net/core/dev.c:10287 register_netdev+0x2d/0x50 net/core/dev.c:10380 br_add_bridge+0x97/0xf0 net/bridge/br_if.c:459 br_ioctl_deviceless_stub+0x6d5/0x770 net/bridge/br_ioctl.c:373 sock_ioctl+0x3e8/0x6a0 net/socket.c:1137 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 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 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 ffff8880130dc000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 11 bytes to the right of 2048-byte region [ffff8880130dc000, ffff8880130dc800) The buggy address belongs to the page: page:ffffea00004c3600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x130d8 head:ffffea00004c3600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880130dc700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880130dc780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880130dc800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880130dc880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880130dc900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================