==================================================================
BUG: KASAN: stack-out-of-bounds in ipmr_ioctl+0xb12/0xbd0 net/ipv4/ipmr.c:1654
Read of size 4 at addr ffffc90006c9fae4 by task syz-executor.4/8311

CPU: 1 PID: 8311 Comm: syz-executor.4 Not tainted 6.4.0-rc7-next-20230621-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364
 print_report mm/kasan/report.c:475 [inline]
 kasan_report+0x11d/0x130 mm/kasan/report.c:588
 ipmr_ioctl+0xb12/0xbd0 net/ipv4/ipmr.c:1654
 raw_ioctl+0x4e/0x1e0 net/ipv4/raw.c:881
 sock_ioctl_out net/core/sock.c:4186 [inline]
 sk_ioctl+0x151/0x440 net/core/sock.c:4214
 inet_ioctl+0x18c/0x380 net/ipv4/af_inet.c:1001
 sock_do_ioctl+0xcc/0x230 net/socket.c:1190
 sock_ioctl+0x1f8/0x680 net/socket.c:1307
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe88308c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe883eda168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe8831abf80 RCX: 00007fe88308c389
RDX: 0000000000000000 RSI: 00000000000089e1 RDI: 0000000000000003
RBP: 00007fe8830d7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd935412ef R14: 00007fe883eda300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.4/8311
 and is located at offset 36 in frame:
 sk_ioctl+0x0/0x440 net/core/sock.c:4172

This frame has 2 objects:
 [32, 36) 'karg'
 [48, 88) 'buffer'

The buggy address belongs to the virtual mapping at
 [ffffc90006c98000, ffffc90006ca1000) created by:
 kernel_clone+0xeb/0x890 kernel/fork.c:2911

The buggy address belongs to the physical page:
page:ffffea00027db900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9f6e4
memcg:ffff88801ef22682
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88801ef22682
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 8308, tgid 8308 (syz-executor.4), ts 634224566400, free_ts 634215563047
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0xfc2/0x2b00 mm/page_alloc.c:3257
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4513
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
 vm_area_alloc_pages mm/vmalloc.c:3059 [inline]
 __vmalloc_area_node mm/vmalloc.c:3135 [inline]
 __vmalloc_node_range+0xb73/0x14b0 mm/vmalloc.c:3316
 alloc_thread_stack_node kernel/fork.c:309 [inline]
 dup_task_struct kernel/fork.c:1112 [inline]
 copy_process+0x13bb/0x75c0 kernel/fork.c:2329
 kernel_clone+0xeb/0x890 kernel/fork.c:2911
 __do_sys_clone+0xba/0x100 kernel/fork.c:3054
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x4dd/0xb90 mm/page_alloc.c:2384
 free_unref_page+0x33/0x370 mm/page_alloc.c:2479
 vfree+0x180/0x7b0 mm/vmalloc.c:2842
 kvfree+0x32/0x50 mm/util.c:648
 ntfs_free fs/ntfs/malloc.h:74 [inline]
 ntfs_fill_super+0x67ca/0x93f0 fs/ntfs/super.c:2912
 mount_bdev+0x315/0x3e0 fs/super.c:1391
 legacy_get_tree+0x109/0x220 fs/fs_context.c:611
 vfs_get_tree+0x8d/0x350 fs/super.c:1519
 do_new_mount fs/namespace.c:3335 [inline]
 path_mount+0x136e/0x1e70 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __x64_sys_mount+0x283/0x300 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffffc90006c9f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
 ffffc90006c9fa00: f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 00 00
>ffffc90006c9fa80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 00 00
                                                       ^
 ffffc90006c9fb00: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffc90006c9fb80: 00 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 f2 f2
==================================================================