================================================================== BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712 Read of size 4 at addr ffff888134fd1430 by task kworker/0:4/5243 CPU: 0 UID: 0 PID: 5243 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: mld mld_ifc_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1d0 mm/kasan/report.c:595 rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712 __netdev_start_xmit include/linux/netdevice.h:5343 [inline] netdev_start_xmit include/linux/netdevice.h:5352 [inline] xmit_one net/core/dev.c:3888 [inline] dev_hard_start_xmit+0x128/0x7a0 net/core/dev.c:3904 sch_direct_xmit+0x194/0x890 net/sched/sch_generic.c:372 __dev_xmit_skb net/core/dev.c:4209 [inline] __dev_queue_xmit+0x278a/0x4930 net/core/dev.c:4831 dev_queue_xmit include/linux/netdevice.h:3401 [inline] neigh_resolve_output net/core/neighbour.c:1619 [inline] neigh_resolve_output+0x51d/0x8f0 net/core/neighbour.c:1599 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xa92/0x1f20 net/ipv6/ip6_output.c:136 __ip6_finish_output+0x359/0xd10 net/ipv6/ip6_output.c:208 ip6_finish_output net/ipv6/ip6_output.c:219 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x2a1/0xa50 net/ipv6/ip6_output.c:246 dst_output include/net/dst.h:470 [inline] NF_HOOK.constprop.0+0x115/0x5a0 include/linux/netfilter.h:318 mld_sendpack+0x923/0xef0 net/ipv6/mcast.c:1855 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x75a/0xc10 net/ipv6/mcast.c:2693 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5906: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_mempool_unpoison_object+0x86/0x150 mm/kasan/common.c:564 kasan_mempool_unpoison_object include/linux/kasan.h:391 [inline] napi_skb_cache_get+0x361/0x8e0 net/core/skbuff.c:306 __alloc_skb+0x5d3/0x710 net/core/skbuff.c:696 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_uevent_skb+0x7d/0x210 lib/kobject_uevent.c:289 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline] kobject_uevent_env+0xd2d/0x18b0 lib/kobject_uevent.c:611 driver_register+0x29c/0x360 drivers/base/driver.c:257 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1720 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline] raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5906: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x43/0x70 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6246 [inline] kmem_cache_free+0x108/0x660 mm/slub.c:6373 kfree_skbmem+0x19a/0x210 net/core/skbuff.c:1137 __kfree_skb net/core/skbuff.c:1204 [inline] consume_skb net/core/skbuff.c:1436 [inline] consume_skb+0xd1/0x110 net/core/skbuff.c:1430 uevent_net_broadcast_untagged lib/kobject_uevent.c:338 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline] kobject_uevent_env+0xd5d/0x18b0 lib/kobject_uevent.c:611 driver_register+0x29c/0x360 drivers/base/driver.c:257 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1720 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline] raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888134fd13c0 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 112 bytes inside of freed 232-byte region [ffff888134fd13c0, ffff888134fd14a8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x134fd1 flags: 0x200000000000000(node=0|zone=2) page_type: f5(slab) raw: 0200000000000000 ffff888102e8c8c0 dead000000000100 dead000000000122 raw: 0000000000000000 00000008000c000c 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 2963, tgid 2963 (syz-executor), ts 133221021023, free_ts 133220122620 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0xf34/0x3a90 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x273/0x28a0 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab mm/slub.c:3467 [inline] new_slab+0xa6/0x6b0 mm/slub.c:3525 refill_objects+0x277/0x420 mm/slub.c:7251 __kmem_cache_alloc_bulk mm/slub.c:7288 [inline] kmem_cache_alloc_bulk_noprof+0x2f4/0x890 mm/slub.c:7340 napi_skb_cache_get+0x688/0x8e0 net/core/skbuff.c:292 __alloc_skb+0x56c/0x710 net/core/skbuff.c:691 napi_alloc_skb+0x42e/0x820 net/core/skbuff.c:853 page_to_skb+0x187/0x1390 drivers/net/virtio_net.c:884 receive_mergeable drivers/net/virtio_net.c:2411 [inline] receive_buf+0x8e6/0x4830 drivers/net/virtio_net.c:2575 virtnet_receive_packets drivers/net/virtio_net.c:2900 [inline] virtnet_receive drivers/net/virtio_net.c:2924 [inline] virtnet_poll+0x14d0/0x2710 drivers/net/virtio_net.c:3013 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7737 napi_poll net/core/dev.c:7800 [inline] net_rx_action+0xa40/0xf20 net/core/dev.c:7957 handle_softirqs+0x1dd/0x9e0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x160/0x210 kernel/softirq.c:735 page last free pid 14 tgid 14 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0x692/0xf10 mm/page_alloc.c:2943 __pagetable_free include/linux/mm.h:3661 [inline] pagetable_free include/linux/mm.h:3685 [inline] pagetable_dtor_free include/linux/mm.h:3784 [inline] __tlb_remove_table include/asm-generic/tlb.h:221 [inline] __tlb_remove_table_free mm/mmu_gather.c:228 [inline] tlb_remove_table_rcu+0x2cf/0x380 mm/mmu_gather.c:291 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869 handle_softirqs+0x1dd/0x9e0 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1076 [inline] run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068 smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888134fd1300: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff888134fd1380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff888134fd1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888134fd1480: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff888134fd1500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================