sctp: [Deprecated]: syz-executor.0 (pid 10715) 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:2771 [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+0x9488/0x95e0 net/sctp/socket.c:4431
Write of size 4 at addr ffff888098188a88 by task syz-executor.0/10715

CPU: 0 PID: 10715 Comm: syz-executor.0 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:2771 [inline]
 sctp_setsockopt net/sctp/socket.c:4499 [inline]
 sctp_setsockopt+0x9488/0x95e0 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:00007f3d8254bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000002e5c0 RCX: 000000000045c1f9
RDX: 0000000000000010 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 000000000078bf50 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffcc379dcdf R14: 00007f3d8254c9c0 R15: 000000000078bf0c

Allocated by task 10715:
 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 10177:
 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
 sysfs_put include/linux/sysfs.h:611 [inline]
 kobject_del+0xfc/0x1f0 lib/kobject.c:631
 kobject_cleanup lib/kobject.c:687 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1f5/0x270 lib/kobject.c:739
 net_rx_queue_update_kobjects+0x33f/0x440 net/core/net-sysfs.c:1024
 remove_queue_kobjects net/core/net-sysfs.c:1699 [inline]
 netdev_unregister_kobject+0x149/0x1e0 net/core/net-sysfs.c:1850
 rollback_registered_many+0xa07/0xf60 net/core/dev.c:9013
 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10131
 unregister_netdevice_many net/core/dev.c:10130 [inline]
 default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:10614
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:189
 setup_net+0x502/0x850 net/core/net_namespace.c:364
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2979
 __do_sys_unshare kernel/fork.c:3047 [inline]
 __se_sys_unshare kernel/fork.c:3045 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3045
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888098188a80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 8 bytes inside of
 32-byte region [ffff888098188a80, ffff888098188aa0)
The buggy address belongs to the page:
page:ffffea0002606200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888098188fc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000256d0c8 ffffea0002a1bc08 ffff8880aa0001c0
raw: ffff888098188fc1 ffff888098188000 0000000100000036 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888098188980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff888098188a00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff888098188a80: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                      ^
 ffff888098188b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff888098188b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================