================================================================== 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:79 [inline] BUG: KASAN: slab-use-after-free in fsnotify_file include/linux/fsnotify.h:125 [inline] BUG: KASAN: slab-use-after-free in fsnotify_close include/linux/fsnotify.h:406 [inline] BUG: KASAN: slab-use-after-free in __fput+0x190/0x8b0 fs/file_table.c:408 Read of size 8 at addr ffff88805e995c50 by task syz-executor.2/5383 CPU: 1 PID: 5383 Comm: syz-executor.2 Not tainted 6.9.0-rc5-next-20240426-syzkaller #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:79 [inline] fsnotify_file include/linux/fsnotify.h:125 [inline] fsnotify_close include/linux/fsnotify.h:406 [inline] __fput+0x190/0x8b0 fs/file_table.c:408 task_work_run+0x24f/0x310 kernel/task_work.c:180 get_signal+0x15e6/0x1740 kernel/signal.c:2681 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x102/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b77a7dea9 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:00007f7b78790178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f7b77babf88 RCX: 00007f7b77a7dea9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7b77babf88 RBP: 00007f7b77babf80 R08: 00007f7b787906c0 R09: 00007f7b787906c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7b77babf8c R13: 000000000000000b R14: 00007ffe3b42d2f0 R15: 00007ffe3b42d3d8 Allocated by task 5383: 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:3934 [inline] slab_alloc_node mm/slub.c:3994 [inline] kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4013 __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:563 [inline] dma_buf_export+0x3dc/0x8d0 drivers/dma-buf/dma-buf.c:648 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:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 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 5383: 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+0xe0/0x150 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:2190 [inline] slab_free mm/slub.c:4430 [inline] kmem_cache_free+0x145/0x340 mm/slub.c:4505 __dentry_kill+0x497/0x630 fs/dcache.c:622 dput+0x19f/0x2b0 fs/dcache.c:845 __fput+0x68c/0x8b0 fs/file_table.c:430 task_work_run+0x24f/0x310 kernel/task_work.c:180 get_signal+0x15e6/0x1740 kernel/signal.c:2681 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xc9/0x370 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 ffff88805e995be8 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of freed 312-byte region [ffff88805e995be8, ffff88805e995d20) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e994 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802da15501 anon flags: 0xfff80000000040(head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000040 ffff888015ef28c0 ffffea00017a6700 0000000000000005 raw: 0000000000000000 0000000000150015 00000001ffffefff ffff88802da15501 head: 00fff80000000040 ffff888015ef28c0 ffffea00017a6700 0000000000000005 head: 0000000000000000 0000000000150015 00000001ffffefff ffff88802da15501 head: 00fff80000000001 ffffea00017a6501 ffffffffffffffff 0000000000000000 head: 0000000000000002 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 5110, tgid 5110 (syz-executor.2), ts 62709047495, free_ts 13838746379 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2259 allocate_slab+0x5a/0x2e0 mm/slub.c:2422 new_slab mm/slub.c:2475 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3661 __slab_alloc+0x58/0xa0 mm/slub.c:3751 __slab_alloc_node mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3982 [inline] kmem_cache_alloc_lru_noprof+0x1c5/0x2b0 mm/slub.c:4013 __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:2764 start_creating+0x187/0x310 fs/debugfs/inode.c:370 __debugfs_create_file+0x73/0x4b0 fs/debugfs/inode.c:415 add_common_files net/mac80211/debugfs_netdev.c:825 [inline] add_files net/mac80211/debugfs_netdev.c:948 [inline] ieee80211_debugfs_add_netdev net/mac80211/debugfs_netdev.c:1012 [inline] ieee80211_debugfs_recreate_netdev+0x332/0x1400 net/mac80211/debugfs_netdev.c:1045 ieee80211_if_add+0x988/0x1770 net/mac80211/iface.c:2190 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:1088 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601 free_contig_range+0x9e/0x160 mm/page_alloc.c:6655 destroy_args+0x8a/0x890 mm/debug_vm_pgtable.c:1037 debug_vm_pgtable+0x4be/0x550 mm/debug_vm_pgtable.c:1417 do_one_initcall+0x248/0x880 init/main.c:1265 do_initcall_level+0x157/0x210 init/main.c:1327 do_initcalls+0x3f/0x80 init/main.c:1343 kernel_init_freeable+0x435/0x5d0 init/main.c:1576 kernel_init+0x1d/0x2b0 init/main.c:1465 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: ffff88805e995b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805e995b80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb >ffff88805e995c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805e995c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e995d00: fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 ==================================================================