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BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x1194/0x1880 net/batman-adv/soft-interface.c:226
Read of size 2 at addr ffff8880a795ca4b by task syz-executor4/31879

CPU: 0 PID: 31879 Comm: syz-executor4 Not tainted 5.0.0-rc1+ #19
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+0x1db/0x2d0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/generic_report.c:145
 batadv_interface_tx+0x1194/0x1880 net/batman-adv/soft-interface.c:226
 __netdev_start_xmit include/linux/netdevice.h:4382 [inline]
 netdev_start_xmit include/linux/netdevice.h:4391 [inline]
 dev_direct_xmit+0x368/0x670 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+0x2753/0x6830 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:631
 __sys_sendto+0x387/0x5f0 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+0x1a3/0x800 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:00007fa61243cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9
RDX: 000000000000000e RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa61243d6d4
R13: 00000000004c53f5 R14: 00000000004d8ef0 R15: 00000000ffffffff

Allocated by task 1:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:496 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
 kasan_kmalloc mm/kasan/common.c:504 [inline]
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411
 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543
 kmem_cache_zalloc include/linux/slab.h:730 [inline]
 __kernfs_new_node+0xfe/0x8a0 fs/kernfs/dir.c:634
 kernfs_new_node+0x99/0x130 fs/kernfs/dir.c:695
 __kernfs_create_file+0x51/0x340 fs/kernfs/file.c:991
 sysfs_add_file_mode_ns+0x222/0x560 fs/sysfs/file.c:306
 sysfs_create_file_ns+0x197/0x280 fs/sysfs/file.c:331
 sysfs_create_file include/linux/sysfs.h:513 [inline]
 device_create_file+0xfa/0x1e0 drivers/base/core.c:1414
 acpi_device_setup_files+0x10b/0x850 drivers/acpi/device_sysfs.c:525
 acpi_device_add+0x9f3/0x1220 drivers/acpi/scan.c:700
 acpi_add_single_object+0xaa5/0x1ec0 drivers/acpi/scan.c:1634
 acpi_bus_check_add+0x4ca/0xac0 drivers/acpi/scan.c:1874
 acpi_ns_walk_namespace+0x22e/0x411 drivers/acpi/acpica/nswalk.c:237
 acpi_walk_namespace drivers/acpi/acpica/nsxfeval.c:606 [inline]
 acpi_walk_namespace+0xf8/0x134 drivers/acpi/acpica/nsxfeval.c:554
 acpi_bus_scan+0x143/0x170 drivers/acpi/scan.c:2055
 acpi_scan_init+0x3d0/0x8c3 drivers/acpi/scan.c:2212
 acpi_init+0x885/0x95e drivers/acpi/bus.c:1248
 do_one_initcall+0x129/0x937 init/main.c:888
 do_initcall_level init/main.c:956 [inline]
 do_initcalls init/main.c:964 [inline]
 do_basic_setup init/main.c:982 [inline]
 kernel_init_freeable+0x4db/0x5ca init/main.c:1135
 kernel_init+0x12/0x1c5 init/main.c:1055
 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 ffff8880a795c9a0
 which belongs to the cache kernfs_node_cache of size 160
The buggy address is located 11 bytes to the right of
 160-byte region [ffff8880a795c9a0, ffff8880a795ca40)
The buggy address belongs to the page:
page:ffffea00029e5700 count:1 mapcount:0 mapping:ffff8880aa16a940 index:0xffff8880a795cfee
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00029e5608 ffffea00029e5788 ffff8880aa16a940
raw: ffff8880a795cfee ffff8880a795c000 0000000100000012 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a795c900: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8880a795c980: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a795ca00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                              ^
 ffff8880a795ca80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a795cb00: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
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