sctp: [Deprecated]: syz-executor.1 (pid 3097) Use of struct sctp_assoc_value in delayed_ack socket option.
Use struct sctp_sack_info instead
==================================================================
BUG: KASAN: slab-out-of-bounds in sctp_setsockopt_delayed_ack net/sctp/socket.c:2773 [inline]
BUG: KASAN: slab-out-of-bounds in sctp_setsockopt net/sctp/socket.c:4499 [inline]
BUG: KASAN: slab-out-of-bounds in sctp_setsockopt+0x91b5/0x95e0 net/sctp/socket.c:4431
Write of size 4 at addr ffff88803c01ecc8 by task syz-executor.1/3097

CPU: 0 PID: 3097 Comm: syz-executor.1 Not tainted 5.8.0-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:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 sctp_setsockopt_delayed_ack net/sctp/socket.c:2773 [inline]
 sctp_setsockopt net/sctp/socket.c:4499 [inline]
 sctp_setsockopt+0x91b5/0x95e0 net/sctp/socket.c:4431
 __sys_setsockopt+0x337/0x6a0 net/socket.c:2137
 __do_sys_setsockopt net/socket.c:2153 [inline]
 __se_sys_setsockopt net/socket.c:2150 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2150
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007f00aba2fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000002f3c0 RCX: 000000000045c1f9
RDX: 0000000000000010 RSI: 0000000000000084 RDI: 0000000000000007
RBP: 000000000078bf50 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fff3f43b2cf R14: 00007f00aba309c0 R15: 000000000078bf0c

Allocated by task 3097:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc_track_caller+0x178/0x330 mm/slab.c:3671
 memdup_user+0x22/0xd0 mm/util.c:172
 sctp_setsockopt net/sctp/socket.c:4452 [inline]
 sctp_setsockopt+0x17a/0x95e0 net/sctp/socket.c:4431
 __sys_setsockopt+0x337/0x6a0 net/socket.c:2137
 __do_sys_setsockopt net/socket.c:2153 [inline]
 __se_sys_setsockopt net/socket.c:2150 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2150
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 7:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x103/0x2c0 mm/slab.c:3757
 kfree_const+0x51/0x60 mm/util.c:40
 kernfs_put.part.0+0x159/0x540 fs/kernfs/dir.c:528
 kernfs_put+0x42/0x50 fs/kernfs/dir.c:511
 __kernfs_remove+0x6ef/0xa30 fs/kernfs/dir.c:1344
 kernfs_remove_by_name_ns+0x51/0xb0 fs/kernfs/dir.c:1516
 kernfs_remove_by_name include/linux/kernfs.h:593 [inline]
 remove_files+0x96/0x1c0 fs/sysfs/group.c:28
 sysfs_remove_group+0x87/0x170 fs/sysfs/group.c:289
 ib_free_port_attrs+0x33c/0x580 drivers/infiniband/core/sysfs.c:1324
 remove_one_compat_dev drivers/infiniband/core/device.c:951 [inline]
 rdma_dev_exit_net+0x2fe/0x540 drivers/infiniband/core/device.c:1089
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

The buggy address belongs to the object at ffff88803c01ecc0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes inside of
 32-byte region [ffff88803c01ecc0, ffff88803c01ece0)
The buggy address belongs to the page:
page:ffffea0000f00780 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88803c01efc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00027458c8 ffffea0002527248 ffff8880aa0001c0
raw: ffff88803c01efc1 ffff88803c01e000 000000010000001c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88803c01eb80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88803c01ec00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff88803c01ec80: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
                                              ^
 ffff88803c01ed00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88803c01ed80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================