==================================================================
BUG: KASAN: slab-out-of-bounds in sctp_getsockopt_pr_streamstatus net/sctp/socket.c:7174 [inline]
BUG: KASAN: slab-out-of-bounds in sctp_getsockopt+0x7516/0x7cc2 net/sctp/socket.c:7582
Read of size 8 at addr ffff8801bd139be8 by task syz-executor756/5555

CPU: 1 PID: 5555 Comm: syz-executor756 Not tainted 4.19.0-rc8-next-20181019+ #98
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+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 sctp_getsockopt_pr_streamstatus net/sctp/socket.c:7174 [inline]
 sctp_getsockopt+0x7516/0x7cc2 net/sctp/socket.c:7582
 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2937
 __sys_getsockopt+0x1ad/0x390 net/socket.c:1940
 __do_sys_getsockopt net/socket.c:1951 [inline]
 __se_sys_getsockopt net/socket.c:1948 [inline]
 __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1948
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445789
Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f366bbfedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445789
RDX: 0000000000000074 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00000000006dac20 R08: 0000000020000040 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 00000000006dac2c
R13: 00007ffc0c2f115f R14: 00007f366bbff9c0 R15: 00000000006dad2c

Allocated by task 5556:
 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]
 sctp_stream_init_ext+0x4f/0xf0 net/sctp/stream.c:237
 sctp_sendmsg_to_asoc+0x1308/0x1a20 net/sctp/socket.c:1896
 sctp_sendmsg+0x13c2/0x1da0 net/sctp/socket.c:2113
 inet_sendmsg+0x19c/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:632
 __sys_sendto+0x3d7/0x670 net/socket.c:1789
 __do_sys_sendto net/socket.c:1801 [inline]
 __se_sys_sendto net/socket.c:1797 [inline]
 __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1797
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 3525:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3817
 kzfree+0x28/0x30 mm/slab_common.c:1564
 aa_free_file_ctx security/apparmor/include/file.h:76 [inline]
 apparmor_file_free_security+0x133/0x1a0 security/apparmor/lsm.c:451
 security_file_free+0x4a/0x80 security/security.c:938
 file_free fs/file_table.c:54 [inline]
 __fput+0x519/0xa70 fs/file_table.c:297
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801bd139b80
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 8 bytes to the right of
 96-byte region [ffff8801bd139b80, ffff8801bd139be0)
The buggy address belongs to the page:
page:ffffea0006f44e40 count:1 mapcount:0 mapping:ffff8801da8004c0 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea0006f44448 ffffea000704ee08 ffff8801da8004c0
raw: 0000000000000000 ffff8801bd139000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801bd139a80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8801bd139b00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff8801bd139b80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
                                                          ^
 ffff8801bd139c00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8801bd139c80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
==================================================================