================================================================== BUG: KASAN: slab-use-after-free in fsnotify_sb_info include/linux/fsnotify_backend.h:542 [inline] BUG: KASAN: slab-use-after-free in fsnotify_sb_has_priority_watchers include/linux/fsnotify.h:24 [inline] BUG: KASAN: slab-use-after-free in fsnotify_sb_has_watchers include/linux/fsnotify.h:36 [inline] BUG: KASAN: slab-use-after-free in fsnotify_name include/linux/fsnotify.h:52 [inline] BUG: KASAN: slab-use-after-free in fsnotify_delete include/linux/fsnotify.h:358 [inline] BUG: KASAN: slab-use-after-free in fsnotify_unlink include/linux/fsnotify.h:389 [inline] BUG: KASAN: slab-use-after-free in simple_recursive_removal+0x604/0x8f0 fs/libfs.c:633 Read of size 8 at addr ffff888035c5a2c0 by task syz-executor/6656 CPU: 1 UID: 0 PID: 6656 Comm: syz-executor Not tainted 6.14.0-rc4-syzkaller-00090-gdd83757f6e68 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 fsnotify_sb_info include/linux/fsnotify_backend.h:542 [inline] fsnotify_sb_has_priority_watchers include/linux/fsnotify.h:24 [inline] fsnotify_sb_has_watchers include/linux/fsnotify.h:36 [inline] fsnotify_name include/linux/fsnotify.h:52 [inline] fsnotify_delete include/linux/fsnotify.h:358 [inline] fsnotify_unlink include/linux/fsnotify.h:389 [inline] simple_recursive_removal+0x604/0x8f0 fs/libfs.c:633 debugfs_remove+0x49/0x70 fs/debugfs/inode.c:805 ieee80211_debugfs_remove_netdev+0x51/0xb0 net/mac80211/debugfs_netdev.c:1021 ieee80211_teardown_sdata net/mac80211/iface.c:813 [inline] ieee80211_if_change_type+0x163/0xaf0 net/mac80211/iface.c:1924 ieee80211_change_iface+0xd2/0x4f0 net/mac80211/cfg.c:242 rdev_change_virtual_intf net/wireless/rdev-ops.h:74 [inline] cfg80211_change_iface+0x796/0xf30 net/wireless/util.c:1217 nl80211_set_interface+0x7d8/0xb40 net/wireless/nl80211.c:4399 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb1f/0xec0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:733 __sys_sendto+0x363/0x4c0 net/socket.c:2187 __do_sys_sendto net/socket.c:2194 [inline] __se_sys_sendto net/socket.c:2190 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2190 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fab5ed8ec7c Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b RSP: 002b:00007fff4ab40300 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fab5fad4620 RCX: 00007fab5ed8ec7c RDX: 0000000000000024 RSI: 00007fab5fad4670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff4ab40354 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fab5fad4670 R15: 0000000000000000 Allocated by task 6772: 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:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4171 anon_vma_chain_alloc mm/rmap.c:142 [inline] anon_vma_fork+0x1fa/0x580 mm/rmap.c:364 dup_mmap kernel/fork.c:711 [inline] dup_mm kernel/fork.c:1700 [inline] copy_mm+0xdba/0x2160 kernel/fork.c:1752 copy_process+0x17d1/0x3cf0 kernel/fork.c:2403 kernel_clone+0x223/0x870 kernel/fork.c:2815 __do_sys_clone kernel/fork.c:2958 [inline] __se_sys_clone kernel/fork.c:2942 [inline] __x64_sys_clone+0x267/0x2e0 kernel/fork.c:2942 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6776: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kmem_cache_free+0x195/0x410 mm/slub.c:4711 anon_vma_chain_free mm/rmap.c:147 [inline] unlink_anon_vmas+0x5a0/0x5f0 mm/rmap.c:447 free_pgtables+0x567/0x840 mm/memory.c:408 exit_mmap+0x522/0xd40 mm/mmap.c:1295 __mmput+0x115/0x410 kernel/fork.c:1356 exit_mm+0x220/0x310 kernel/exit.c:570 do_exit+0x9ad/0x28e0 kernel/exit.c:925 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888035c5a2a0 which belongs to the cache anon_vma_chain of size 80 The buggy address is located 32 bytes inside of freed 80-byte region [ffff888035c5a2a0, ffff888035c5a2f0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35c5a memcg:ffff8880322eb401 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c282280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000240024 00000000f5000000 ffff8880322eb401 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 6775, tgid 6775 (sed), ts 112972817647, free_ts 110255665592 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4171 anon_vma_chain_alloc mm/rmap.c:142 [inline] anon_vma_clone+0x98/0x4e0 mm/rmap.c:288 __split_vma+0x351/0xbf0 mm/vma.c:486 split_vma mm/vma.c:542 [inline] vma_modify+0x244/0x330 mm/vma.c:1529 vma_modify_flags+0x3a5/0x430 mm/vma.c:1547 mprotect_fixup+0x45a/0xaa0 mm/mprotect.c:666 do_mprotect_pkey+0x99d/0xdd0 mm/mprotect.c:840 __do_sys_mprotect mm/mprotect.c:861 [inline] __se_sys_mprotect mm/mprotect.c:858 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:858 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 page last free pid 6556 tgid 6556 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe04/0x10e0 mm/page_alloc.c:2660 vfree+0x1c3/0x360 mm/vmalloc.c:3383 kcov_put kernel/kcov.c:439 [inline] kcov_close+0x28/0x50 kernel/kcov.c:535 __fput+0x3e9/0x9f0 fs/file_table.c:464 task_work_run+0x24f/0x310 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x168c/0x1720 kernel/signal.c:3036 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888035c5a180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888035c5a200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb >ffff888035c5a280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc ^ ffff888035c5a300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888035c5a380: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ==================================================================