================================================================== BUG: KASAN: slab-use-after-free in d_inode include/linux/dcache.h:520 [inline] BUG: KASAN: slab-use-after-free in fsnotify_parent include/linux/fsnotify.h:66 [inline] BUG: KASAN: slab-use-after-free in fsnotify_file include/linux/fsnotify.h:106 [inline] BUG: KASAN: slab-use-after-free in fsnotify_close include/linux/fsnotify.h:387 [inline] BUG: KASAN: slab-use-after-free in __fput+0x1b8/0x8a0 fs/file_table.c:408 Read of size 8 at addr ffff88807ab3bad8 by task syz-executor.0/10980 CPU: 0 PID: 10980 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 d_inode include/linux/dcache.h:520 [inline] fsnotify_parent include/linux/fsnotify.h:66 [inline] fsnotify_file include/linux/fsnotify.h:106 [inline] fsnotify_close include/linux/fsnotify.h:387 [inline] __fput+0x1b8/0x8a0 fs/file_table.c:408 task_work_run+0x24f/0x310 kernel/task_work.c:180 get_signal+0x1673/0x1850 kernel/signal.c:2683 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f4420e7de69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4421ba9178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f4420fac058 RCX: 00007f4420e7de69 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4420fac058 RBP: 00007f4420fac050 R08: 00007f4421ba96c0 R09: 00007f4421ba96c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4420fac05c R13: 000000000000000b R14: 00007f44210cf960 R15: 00007f44210cfa48 Allocated by task 10982: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc_lru+0x178/0x350 mm/slub.c:3864 __d_alloc+0x31/0x700 fs/dcache.c:1624 d_alloc_pseudo+0x1f/0xb0 fs/dcache.c:1756 alloc_path_pseudo fs/file_table.c:330 [inline] alloc_file_pseudo+0x123/0x290 fs/file_table.c:346 dma_buf_getfile drivers/dma-buf/dma-buf.c:547 [inline] dma_buf_export+0x3dd/0x990 drivers/dma-buf/dma-buf.c:632 udmabuf_create+0x78e/0xa10 drivers/dma-buf/udmabuf.c:272 udmabuf_ioctl_create drivers/dma-buf/udmabuf.c:309 [inline] udmabuf_ioctl+0x304/0x4f0 drivers/dma-buf/udmabuf.c:340 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 10980: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x102/0x2b0 mm/slub.c:4344 __dentry_kill+0x497/0x630 fs/dcache.c:622 dput+0x19f/0x2b0 fs/dcache.c:845 __fput+0x678/0x8a0 fs/file_table.c:430 task_work_run+0x24f/0x310 kernel/task_work.c:180 get_signal+0x1673/0x1850 kernel/signal.c:2683 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff88807ab3ba70 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of freed 312-byte region [ffff88807ab3ba70, ffff88807ab3bba8) The buggy address belongs to the physical page: page:ffffea0001eace80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ab3a head:ffffea0001eace80 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880231f6e01 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888015aed8c0 ffffea0001872b00 dead000000000002 raw: 0000000000000000 0000000080150015 00000001ffffffff ffff8880231f6e01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 6613, tgid 6609 (syz-executor.3), ts 135019844832, free_ts 134716887807 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc_lru+0x253/0x350 mm/slub.c:3864 __d_alloc+0x31/0x700 fs/dcache.c:1624 d_alloc fs/dcache.c:1704 [inline] d_alloc_parallel+0xdf/0x1600 fs/dcache.c:2462 __lookup_slow+0x117/0x3f0 fs/namei.c:1677 lookup_one_len+0x18b/0x2d0 fs/namei.c:2756 start_creating+0x187/0x310 fs/debugfs/inode.c:382 __debugfs_create_file+0x72/0x490 fs/debugfs/inode.c:427 kvm_create_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:1133 [inline] kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1283 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:5443 [inline] kvm_dev_ioctl+0x1b55/0x2390 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5485 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_64+0xfb/0x240 page last free pid 4883 tgid 4883 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2437 [inline] __put_partials+0xeb/0x130 mm/slub.c:2906 put_cpu_partial+0x17c/0x250 mm/slub.c:2981 __slab_free+0x2ea/0x3d0 mm/slub.c:4151 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmalloc_trace+0x16f/0x360 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] kobject_uevent_env+0x28b/0x8f0 lib/kobject_uevent.c:524 really_probe+0x80a/0xc50 drivers/base/dd.c:708 __driver_probe_device+0x1a2/0x3e0 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 __device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958 bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:457 __device_attach+0x333/0x520 drivers/base/dd.c:1030 Memory state around the buggy address: ffff88807ab3b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807ab3ba00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb >ffff88807ab3ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ab3bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ab3bb80: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb ==================================================================