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BUG: KASAN: slab-use-after-free in consumer_filter kernel/events/uprobes.c:869 [inline]
BUG: KASAN: slab-use-after-free in filter_chain+0xf6/0x110 kernel/events/uprobes.c:880
Read of size 8 at addr ffff88804b2ae2b0 by task syz.0.4319/15400

CPU: 3 UID: 0 PID: 15400 Comm: syz.0.4319 Not tainted 6.11.0-rc7-syzkaller-00021-g7c6a3a65ace7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 consumer_filter kernel/events/uprobes.c:869 [inline]
 filter_chain+0xf6/0x110 kernel/events/uprobes.c:880
 uprobe_mmap+0x46b/0x1240 kernel/events/uprobes.c:1387
 mmap_region+0x1228/0x2760 mm/mmap.c:3058
 do_mmap+0xbfb/0xfb0 mm/mmap.c:1468
 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588
 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1514
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe6d137def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe6d2111038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fe6d1535f80 RCX: 00007fe6d137def9
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020000000
RBP: 00007fe6d13f0b56 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe6d1535f80 R15: 00007ffd43d25818
 </TASK>

Allocated by task 15185:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4162 [inline]
 __kmalloc_noprof+0x1e8/0x400 mm/slub.c:4174
 kmalloc_noprof include/linux/slab.h:685 [inline]
 kzalloc_noprof include/linux/slab.h:807 [inline]
 tomoyo_encode2+0x100/0x3e0 security/tomoyo/realpath.c:45
 tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80
 tomoyo_realpath_from_path+0x19d/0x720 security/tomoyo/realpath.c:283
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x273/0x450 security/tomoyo/file.c:822
 tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:212
 security_path_symlink+0x108/0x170 security/security.c:1876
 do_symlinkat+0x10e/0x310 fs/namei.c:4592
 __do_sys_symlinkat fs/namei.c:4610 [inline]
 __se_sys_symlinkat fs/namei.c:4607 [inline]
 __x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4607
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15185:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2256 [inline]
 slab_free mm/slub.c:4477 [inline]
 kfree+0x12a/0x3b0 mm/slub.c:4598
 tomoyo_path_perm+0x299/0x450 security/tomoyo/file.c:842
 tomoyo_path_symlink+0x98/0xe0 security/tomoyo/tomoyo.c:212
 security_path_symlink+0x108/0x170 security/security.c:1876
 do_symlinkat+0x10e/0x310 fs/namei.c:4592
 __do_sys_symlinkat fs/namei.c:4610 [inline]
 __se_sys_symlinkat fs/namei.c:4607 [inline]
 __x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4607
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88804b2ae280
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 48 bytes inside of
 freed 64-byte region [ffff88804b2ae280, ffff88804b2ae2c0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804b2aea80 pfn:0x4b2ae
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff88801ac428c0 0000000000000000 dead000000000001
raw: ffff88804b2aea80 000000008020000b 00000001fdffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5356, tgid 5356 (syz-executor), ts 56290186790, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500
 prep_new_page mm/page_alloc.c:1508 [inline]
 get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446
 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x4e/0xf0 mm/slub.c:2325
 allocate_slab mm/slub.c:2488 [inline]
 new_slab+0x84/0x260 mm/slub.c:2541
 ___slab_alloc+0xdac/0x1870 mm/slub.c:3727
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3817
 __slab_alloc_node mm/slub.c:3870 [inline]
 slab_alloc_node mm/slub.c:4029 [inline]
 __do_kmalloc_node mm/slub.c:4161 [inline]
 __kmalloc_noprof+0x367/0x400 mm/slub.c:4174
 kmalloc_noprof include/linux/slab.h:685 [inline]
 kzalloc_noprof include/linux/slab.h:807 [inline]
 kobject_get_path+0xd9/0x2b0 lib/kobject.c:161
 kobject_uevent_env+0x289/0x1860 lib/kobject_uevent.c:545
 rx_queue_add_kobject net/core/net-sysfs.c:1120 [inline]
 net_rx_queue_update_kobjects+0x17a/0x5f0 net/core/net-sysfs.c:1160
 register_queue_kobjects net/core/net-sysfs.c:1895 [inline]
 netdev_register_kobject+0x26d/0x3f0 net/core/net-sysfs.c:2140
 register_netdevice+0x1473/0x1e90 net/core/dev.c:10444
 veth_newlink+0x366/0x9e0 drivers/net/veth.c:1829
 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline]
 __rtnl_newlink+0x1197/0x1920 net/core/rtnetlink.c:3730
 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3743
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88804b2ae180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88804b2ae200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88804b2ae280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                     ^
 ffff88804b2ae300: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88804b2ae380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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