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BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter drivers/misc/watch_queue.c:516 [inline]
BUG: KASAN: slab-out-of-bounds in watch_queue_ioctl+0x137a/0x15e0 drivers/misc/watch_queue.c:555
Write of size 4 at addr ffff8880a5c6585c by task syz-executor.1/7948

CPU: 1 PID: 7948 Comm: syz-executor.1 Not tainted 5.4.0-rc2-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+0x113/0x167 lib/dump_stack.c:113
 print_address_description.constprop.8.cold.10+0x9/0x31d mm/kasan/report.c:374
 __kasan_report.cold.11+0x1b/0x3a mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:634
 __asan_report_store4_noabort+0x17/0x20 mm/kasan/generic_report.c:136
 watch_queue_set_filter drivers/misc/watch_queue.c:516 [inline]
 watch_queue_ioctl+0x137a/0x15e0 drivers/misc/watch_queue.c:555
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696
 ksys_ioctl+0x62/0x90 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718
 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f58f2da1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000020000240 RSI: 0000000000005761 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f58f2da26d4
R13: 00000000004cfb90 R14: 00000000004d8eb8 R15: 00000000ffffffff

Allocated by task 7948:
 save_stack+0x21/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc.constprop.13+0xc7/0xd0 mm/kasan/common.c:510
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x164/0x790 mm/slab.c:3664
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 watch_queue_set_filter drivers/misc/watch_queue.c:505 [inline]
 watch_queue_ioctl+0x2c4/0x15e0 drivers/misc/watch_queue.c:555
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x196/0x1150 fs/ioctl.c:696
 ksys_ioctl+0x62/0x90 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718
 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7844:
 save_stack+0x21/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x108/0x2c0 mm/slab.c:3756
 tomoyo_check_open_permission+0x15f/0x2f0 security/tomoyo/file.c:786
 tomoyo_file_open+0x81/0xa0 security/tomoyo/tomoyo.c:319
 security_file_open+0x46/0x240 security/security.c:1497
 do_dentry_open+0x2db/0x1100 fs/open.c:784
 vfs_open+0x9a/0xc0 fs/open.c:914
 do_last fs/namei.c:3408 [inline]
 path_openat+0xb76/0x3d00 fs/namei.c:3525
 do_filp_open+0x177/0x250 fs/namei.c:3555
 do_sys_open+0x1dd/0x370 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x79/0xb0 fs/open.c:1110
 do_syscall_64+0xca/0x5d0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a5c65840
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 28 bytes inside of
 32-byte region [ffff8880a5c65840, ffff8880a5c65860)
The buggy address belongs to the page:
page:ffffea0002971940 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a5c65fc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00029e7348 ffffea00025908c8 ffff8880aa4001c0
raw: ffff8880a5c65fc1 ffff8880a5c65000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a5c65700: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a5c65780: fb fb fb fb fc fc fc fc 00 00 05 fc fc fc fc fc
>ffff8880a5c65800: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
                                                    ^
 ffff8880a5c65880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a5c65900: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
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