================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] BUG: KASAN: slab-use-after-free in __refcount_sub_and_test include/linux/refcount.h:389 [inline] BUG: KASAN: slab-use-after-free in __refcount_dec_and_test include/linux/refcount.h:432 [inline] BUG: KASAN: slab-use-after-free in refcount_dec_and_test include/linux/refcount.h:450 [inline] BUG: KASAN: slab-use-after-free in put_dev drivers/usb/gadget/legacy/inode.c:165 [inline] BUG: KASAN: slab-use-after-free in gadgetfs_kill_sb+0x43/0x110 drivers/usb/gadget/legacy/inode.c:2114 Write of size 4 at addr ffff888029d41840 Write of size 4 at addr ffff888029d41840 by task syz.2.849/10488 CPU: 1 UID: 0 PID: 10488 Comm: syz.2.849 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 instrument_atomic_read_write include/linux/instrumented.h:112 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] __refcount_sub_and_test include/linux/refcount.h:389 [inline] __refcount_dec_and_test include/linux/refcount.h:432 [inline] refcount_dec_and_test include/linux/refcount.h:450 [inline] put_dev drivers/usb/gadget/legacy/inode.c:165 [inline] gadgetfs_kill_sb+0x43/0x110 drivers/usb/gadget/legacy/inode.c:2114 deactivate_locked_super+0xbc/0x110 fs/super.c:589 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:1008 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151 get_signal+0x1216/0x12c0 kernel/signal.c:3051 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop kernel/entry/common.c:101 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x2ba/0x910 kernel/entry/common.c:152 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f1145453bd7 Code: Unable to access opcode bytes at 0x7f1145453bad. RSP: 002b:00007f114636c120 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f114559e159 RDX: 00007f114636c140 RSI: 00007f114636c270 RDI: 000000000000000b RBP: 00007f1145635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f1145826038 R14: 00007f1145825fa0 R15: 00007ffe338e8568 Allocated by task 12: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5419 [inline] __kmalloc_noprof+0x366/0x710 mm/slub.c:5444 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ieee802_11_parse_elems_full+0x14b/0x2de0 net/mac80211/parse.c:1071 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2548 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1542 [inline] ieee80211_ibss_rx_queued_mgmt+0x509/0x2c40 net/mac80211/ibss.c:1573 ieee80211_iface_process_skb net/mac80211/iface.c:1769 [inline] ieee80211_iface_work+0x78a/0x1010 net/mac80211/iface.c:1823 cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:541 process_one_work kernel/workqueue.c:3399 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3482 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3563 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 12: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6505 [inline] kfree+0x1c5/0x650 mm/slub.c:6798 ieee80211_ibss_rx_queued_mgmt+0x1e9c/0x2c40 net/mac80211/ibss.c:-1 ieee80211_iface_process_skb net/mac80211/iface.c:1769 [inline] ieee80211_iface_work+0x78a/0x1010 net/mac80211/iface.c:1823 cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:541 process_one_work kernel/workqueue.c:3399 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3482 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3563 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888029d41800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of freed 1024-byte region [ffff888029d41800, ffff888029d41c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29d40 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5618, tgid 5618 (syz-executor), ts 91342577962 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1853 prep_new_page mm/page_alloc.c:1861 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3925 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5418 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7416 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5418 [inline] __kmalloc_node_noprof+0x548/0x720 mm/slub.c:5431 _kmalloc_node_noprof include/linux/slab.h:1200 [inline] qdisc_alloc+0x92/0x9d0 net/sched/sch_generic.c:998 qdisc_create_dflt+0x8e/0x4e0 net/sched/sch_generic.c:1053 attach_one_default_qdisc net/sched/sch_generic.c:1219 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2749 [inline] attach_default_qdiscs net/sched/sch_generic.c:1237 [inline] dev_activate+0x37a/0x1150 net/sched/sch_generic.c:1296 __dev_open+0x699/0x850 net/core/dev.c:1733 __dev_change_flags+0x329/0x820 net/core/dev.c:9812 netif_change_flags+0x7c/0x1b0 net/core/dev.c:9877 do_setlink+0xdd6/0x4670 net/core/rtnetlink.c:3266 rtnl_changelink net/core/rtnetlink.c:3905 [inline] __rtnl_newlink net/core/rtnetlink.c:4076 [inline] rtnl_newlink+0x15a3/0x1c30 net/core/rtnetlink.c:4215 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7132 page last free pid 5731 tgid 5731 ts 91337264330 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1400 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2944 __slab_free+0x274/0x2c0 mm/slub.c:5820 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] __kmalloc_cache_noprof+0x29a/0x600 mm/slub.c:5564 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ____ip_mc_inc_group+0x518/0xdb0 net/ipv4/igmp.c:1601 __ip_mc_inc_group net/ipv4/igmp.c:1639 [inline] ip_mc_inc_group net/ipv4/igmp.c:1645 [inline] ip_mc_up+0x115/0x2e0 net/ipv4/igmp.c:1950 inetdev_event+0xfc3/0x15e0 net/ipv4/devinet.c:1630 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline] call_netdevice_notifiers net/core/dev.c:2327 [inline] __dev_notify_flags+0x31e/0x510 net/core/dev.c:9853 netif_change_flags+0xde/0x1b0 net/core/dev.c:9882 vlan_dev_work+0x182/0x520 net/8021q/vlan_dev.c:-1 netdev_work_run net/core/netdev_work.c:127 [inline] netdev_work_proc+0x503/0x770 net/core/netdev_work.c:171 process_one_work kernel/workqueue.c:3399 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3482 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3563 Memory state around the buggy address: ffff888029d41700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029d41780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888029d41800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029d41880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029d41900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================