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BUG: KASAN: slab-out-of-bounds in sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
Read of size 2 at addr ffff8801d788a948 by task syz-executor7/4904

CPU: 1 PID: 4904 Comm: syz-executor7 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
 sctp_send_reset_streams+0xadf/0xc10 net/sctp/stream.c:314
 sctp_setsockopt_reset_streams net/sctp/socket.c:3905 [inline]
 sctp_setsockopt+0x70d/0x5d50 net/sctp/socket.c:4195
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
 SYSC_setsockopt net/socket.c:1829 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1808
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007ff898f78c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000000077 RSI: 0000000000000084 RDI: 0000000000000014
RBP: 0000000000000349 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000020e73ff8 R11: 0000000000000212 R12: 00000000006f2f78
R13: 00000000ffffffff R14: 00007ff898f796d4 R15: 0000000000000000

Allocated by task 4904:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3712 [inline]
 __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3727
 memdup_user+0x2c/0x90 mm/util.c:164
 sctp_setsockopt_reset_streams net/sctp/socket.c:3897 [inline]
 sctp_setsockopt+0x6a6/0x5d50 net/sctp/socket.c:4195
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
 SYSC_setsockopt net/socket.c:1829 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1808
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 1:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3492 [inline]
 kfree+0xca/0x250 mm/slab.c:3807
 acpi_os_free include/acpi/platform/aclinuxex.h:96 [inline]
 acpi_ns_get_node_unlocked+0x294/0x2ca drivers/acpi/acpica/nsutils.c:732
 acpi_ns_get_node+0x44/0x62 drivers/acpi/acpica/nsutils.c:772
 acpi_get_handle+0x134/0x227 drivers/acpi/acpica/nsxfname.c:131
 acpi_has_method+0x6a/0xa0 drivers/acpi/utils.c:555
 acpi_is_video_device+0xd7/0x280 drivers/acpi/scan.c:1141
 acpi_set_pnp_ids drivers/acpi/scan.c:1278 [inline]
 acpi_init_device_object+0x12d2/0x1b70 drivers/acpi/scan.c:1558
 acpi_add_single_object+0x1ca/0x1d80 drivers/acpi/scan.c:1590
 acpi_bus_check_add+0x380/0xa50 drivers/acpi/scan.c:1830
 acpi_ns_walk_namespace+0x1d1/0x31e drivers/acpi/acpica/nswalk.c:270
 acpi_walk_namespace+0xb5/0xef drivers/acpi/acpica/nsxfeval.c:641
 acpi_bus_scan+0x120/0x150 drivers/acpi/scan.c:2011
 acpi_scan_init+0x3ce/0x848 drivers/acpi/scan.c:2168
 acpi_init+0x830/0x8e6 drivers/acpi/bus.c:1228
 do_one_initcall+0x9e/0x330 init/main.c:833
 do_initcall_level init/main.c:899 [inline]
 do_initcalls init/main.c:907 [inline]
 do_basic_setup init/main.c:925 [inline]
 kernel_init_freeable+0x469/0x521 init/main.c:1073
 kernel_init+0x13/0x172 init/main.c:1000
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

The buggy address belongs to the object at ffff8801d788a940
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes inside of
 32-byte region [ffff8801d788a940, ffff8801d788a960)
The buggy address belongs to the page:
page:000000005511427d count:1 mapcount:0 mapping:000000007dafb702 index:0xffff8801d788afc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d788a000 ffff8801d788afc1 000000010000003f
raw: ffffea00075e2460 ffffea00076b5e60 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d788a800: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d788a880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d788a900: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
                                              ^
 ffff8801d788a980: 00 01 fc fc fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff8801d788aa00: 02 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
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