==================================================================
BUG: KASAN: slab-out-of-bounds in ether_addr_equal include/linux/etherdevice.h:322 [inline]
BUG: KASAN: slab-out-of-bounds in ether_addr_equal_unaligned include/linux/etherdevice.h:376 [inline]
BUG: KASAN: slab-out-of-bounds in batadv_compare_eth net/batman-adv/main.h:283 [inline]
BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x1670/0x18b0 net/batman-adv/soft-interface.c:265
Read of size 4 at addr ffff8880a433577f by task syz-executor0/18992

CPU: 1 PID: 18992 Comm: syz-executor0 Not tainted 4.20.0+ #363
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 ether_addr_equal include/linux/etherdevice.h:322 [inline]
 ether_addr_equal_unaligned include/linux/etherdevice.h:376 [inline]
 batadv_compare_eth net/batman-adv/main.h:283 [inline]
 batadv_interface_tx+0x1670/0x18b0 net/batman-adv/soft-interface.c:265
 __netdev_start_xmit include/linux/netdevice.h:4382 [inline]
 netdev_start_xmit include/linux/netdevice.h:4391 [inline]
 dev_direct_xmit+0x36c/0x6a0 net/core/dev.c:3930
 packet_direct_xmit+0xfb/0x170 net/packet/af_packet.c:246
 packet_snd net/packet/af_packet.c:2932 [inline]
 packet_sendmsg+0x298a/0x6ad0 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:631
 __sys_sendto+0x3d7/0x670 net/socket.c:1788
 __do_sys_sendto net/socket.c:1800 [inline]
 __se_sys_sendto net/socket.c:1796 [inline]
 __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5775ff9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9
RDX: 000000000000000e RSI: 0000000020000180 RDI: 0000000000000003
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5775ffa6d4
R13: 00000000004c51e5 R14: 00000000004d8938 R15: 00000000ffffffff

Allocated by task 1:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620
 kmalloc include/linux/slab.h:546 [inline]
 kzalloc include/linux/slab.h:741 [inline]
 bus_add_driver+0xcf/0x5d0 drivers/base/bus.c:646
 driver_register+0x1c8/0x320 drivers/base/driver.c:170
 register_virtio_driver+0x79/0xd0 drivers/virtio/virtio.c:296
 virtio_gpu_driver_init+0x15/0x17 drivers/gpu/drm/virtio/virtgpu_drv.c:96
 do_one_initcall+0x145/0x957 init/main.c:889
 do_initcall_level init/main.c:957 [inline]
 do_initcalls init/main.c:965 [inline]
 do_basic_setup init/main.c:983 [inline]
 kernel_init_freeable+0x4c1/0x5b4 init/main.c:1147
 kernel_init+0x11/0x1ae init/main.c:1067
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880a4335640
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 63 bytes to the right of
 256-byte region [ffff8880a4335640, ffff8880a4335740)
The buggy address belongs to the page:
page:ffffea000290cd40 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00028f6088 ffffea000290ca88 ffff88812c3f07c0
raw: 0000000000000000 ffff8880a4335000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a4335600: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8880a4335680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a4335700: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff8880a4335780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a4335800: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
kobject: 'loop2' (000000005ae68067): fill_kobj_path: path = '/devices/virtual/block/loop2'
==================================================================