================================================================== BUG: KASAN: slab-use-after-free in device_for_each_child+0xa8/0x174 drivers/base/core.c:4044 Read of size 8 at addr ffff0000e3fd95f8 by task kbnepd bnep0/7719 CPU: 0 PID: 7719 Comm: kbnepd bnep0 Not tainted 6.9.0-rc4-syzkaller-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 device_for_each_child+0xa8/0x174 drivers/base/core.c:4044 pm_runtime_set_memalloc_noio+0xf0/0x210 drivers/base/power/runtime.c:248 netdev_unregister_kobject+0x148/0x208 net/core/net-sysfs.c:2106 unregister_netdevice_many_notify+0x117c/0x1770 net/core/dev.c:11129 unregister_netdevice_many net/core/dev.c:11157 [inline] unregister_netdevice_queue net/core/dev.c:11036 [inline] unregister_netdevice include/linux/netdevice.h:3115 [inline] unregister_netdev+0x180/0x1f8 net/core/dev.c:11175 bnep_session+0x23bc/0x257c net/bluetooth/bnep/core.c:525 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 23: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x74/0x8c 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_node+0x224/0x418 mm/slub.c:3888 kmalloc_reserve+0xdc/0x280 net/core/skbuff.c:577 __alloc_skb+0x20c/0x420 net/core/skbuff.c:668 skb_copy+0xcc/0x65c net/core/skbuff.c:2128 mac80211_hwsim_tx_frame_no_nl+0xd68/0x150c drivers/net/wireless/virtual/mac80211_hwsim.c:1854 mac80211_hwsim_tx_frame+0x1c4/0x1f8 drivers/net/wireless/virtual/mac80211_hwsim.c:2200 __mac80211_hwsim_beacon_tx+0x368/0x52c drivers/net/wireless/virtual/mac80211_hwsim.c:2250 mac80211_hwsim_beacon_tx+0x35c/0x6a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2300 __iterate_interfaces+0x204/0x484 net/mac80211/util.c:772 ieee80211_iterate_active_interfaces_atomic+0xd4/0x180 net/mac80211/util.c:808 mac80211_hwsim_beacon+0xcc/0x1c8 drivers/net/wireless/virtual/mac80211_hwsim.c:2326 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x4a0/0xd08 kernel/time/hrtimer.c:1756 hrtimer_run_softirq+0x158/0x21c kernel/time/hrtimer.c:1773 __do_softirq+0x2e4/0xd2c kernel/softirq.c:554 Freed by task 42: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object+0x124/0x18c mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 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+0x168/0x3f0 mm/slub.c:4344 skb_kfree_head net/core/skbuff.c:1094 [inline] skb_free_head+0xcc/0x1c4 net/core/skbuff.c:1108 skb_release_data+0x430/0x628 net/core/skbuff.c:1136 skb_release_all net/core/skbuff.c:1202 [inline] __kfree_skb net/core/skbuff.c:1216 [inline] kfree_skb_reason+0x1c4/0x4a8 net/core/skbuff.c:1252 kfree_skb include/linux/skbuff.h:1262 [inline] ieee80211_iface_work+0x218/0xc80 net/mac80211/iface.c:1661 cfg80211_wiphy_work+0x1fc/0x240 net/wireless/core.c:437 process_one_work+0x7b8/0x15d4 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:3416 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 The buggy address belongs to the object at ffff0000e3fd9500 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 248 bytes inside of freed 640-byte region [ffff0000e3fd9500, ffff0000e3fd9780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123fd8 head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffe00000000840(slab|head|node=0|zone=2|lastcpupid=0xfff) page_type: 0xffffffff() raw: 05ffe00000000840 ffff0000c1bc4a00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 05ffe00000000840 ffff0000c1bc4a00 dead000000000122 0000000000000000 head: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000 head: 05ffe00000000002 fffffdffc38ff601 dead000000000122 00000000ffffffff head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e3fd9480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000e3fd9500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000e3fd9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000e3fd9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000e3fd9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================