================================================================== 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 ffff88807e236c28 by task syz-executor273/5120 CPU: 0 PID: 5120 Comm: syz-executor273 Not tainted 6.9.0-rc5-syzkaller-00296-g5eb4573ea63d #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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f85a1f60599 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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:00007f85a1f1b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: 0000000000000001 RBX: 00007f85a1fea348 RCX: 00007f85a1f60599 RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 00007f85a1fea340 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000fa R11: 0000000000000246 R12: 00007f85a1fb718c R13: 00007f85a1fb7078 R14: 00667562616d6475 R15: 6d64752f7665642f Allocated by task 5128: 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_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5128: 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+0x10b/0x2c0 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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807e236bc0 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of freed 312-byte region [ffff88807e236bc0, ffff88807e236cf8) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e236 head: order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff888015eeb8c0 ffffea0001f89100 dead000000000003 raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 00fff80000000840 ffff888015eeb8c0 ffffea0001f89100 dead000000000003 head: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 00fff80000000001 ffffea0001f88d81 dead000000000122 00000000ffffffff head: 0000000200000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 4540, tgid -1281857381 (udevd), ts 4540, free_ts 14990488689 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __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+0x4b/0x190 fs/dcache.c:1704 lookup_one_qstr_excl+0xce/0x260 fs/namei.c:1603 filename_create+0x297/0x540 fs/namei.c:3893 do_symlinkat+0xf9/0x3a0 fs/namei.c:4500 __do_sys_symlink fs/namei.c:4528 [inline] __se_sys_symlink fs/namei.c:4526 [inline] __x64_sys_symlink+0x7e/0x90 fs/namei.c:4526 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x986/0xab0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 free_contig_range+0x9e/0x160 mm/page_alloc.c:6572 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1036 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1416 do_one_initcall+0x248/0x880 init/main.c:1245 do_initcall_level+0x157/0x210 init/main.c:1307 do_initcalls+0x3f/0x80 init/main.c:1323 kernel_init_freeable+0x435/0x5d0 init/main.c:1555 kernel_init+0x1d/0x2b0 init/main.c:1444 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88807e236b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807e236b80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88807e236c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807e236c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ffff88807e236d00: fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 ==================================================================