configfs-gadget gadget: uvc: uvc_function_bind() configfs-gadget gadget: uvc: Unable to allocate streaming EP ================================================================== BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:290 [inline] BUG: KASAN: slab-out-of-bounds in dummy_free_request+0x3b/0x70 drivers/usb/gadget/udc/dummy_hcd.c:687 Read of size 8 at addr ffff888060cfc4f0 by task syz.5.1665/10652 CPU: 1 PID: 10652 Comm: syz.5.1665 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 list_empty include/linux/list.h:290 [inline] dummy_free_request+0x3b/0x70 drivers/usb/gadget/udc/dummy_hcd.c:687 uvc_function_bind+0xe24/0x12d0 drivers/usb/gadget/function/f_uvc.c:785 usb_add_function+0x2d9/0x980 drivers/usb/gadget/composite.c:324 configfs_composite_bind+0xa02/0xf60 drivers/usb/gadget/configfs.c:1417 udc_bind_to_driver+0x203/0x5f0 drivers/usb/gadget/udc/core.c:1574 usb_gadget_probe_driver+0x1fb/0x380 drivers/usb/gadget/udc/core.c:1637 gadget_dev_desc_UDC_store+0x1ba/0x2e0 drivers/usb/gadget/configfs.c:289 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fb86357fe99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb8617d8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb863807fa0 RCX: 00007fb86357fe99 RDX: 000000000000000b RSI: 0000200000000880 RDI: 0000000000000003 RBP: 00007fb863615eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb863808038 R14: 00007fb863807fa0 R15: 00007ffdb81ef918 Allocated by task 4229: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] __hw_addr_create net/core/dev_addr_lists.c:29 [inline] __hw_addr_add_ex+0x1ed/0x780 net/core/dev_addr_lists.c:93 __dev_mc_add net/core/dev_addr_lists.c:832 [inline] dev_mc_add+0x91/0x110 net/core/dev_addr_lists.c:850 igmp6_group_added+0x228/0x7c0 net/ipv6/mcast.c:684 __ipv6_dev_mc_inc+0x959/0xb20 net/ipv6/mcast.c:955 addrconf_join_solict net/ipv6/addrconf.c:2211 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4026 [inline] addrconf_dad_work+0x3bd/0x1530 net/ipv6/addrconf.c:4153 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 kvfree_call_rcu+0x105/0x7f0 kernel/rcu/tree.c:3600 __hw_addr_del_entry net/core/dev_addr_lists.c:145 [inline] __hw_addr_del_ex+0x521/0x620 net/core/dev_addr_lists.c:194 __dev_mc_del net/core/dev_addr_lists.c:873 [inline] dev_mc_del+0x8d/0x100 net/core/dev_addr_lists.c:891 ip_mc_filter_del net/ipv4/igmp.c:1168 [inline] __igmp_group_dropped+0x1e2/0x910 net/ipv4/igmp.c:1301 igmp_group_dropped net/ipv4/igmp.c:1332 [inline] ip_mc_down+0xf2/0x340 net/ipv4/igmp.c:1741 inetdev_event+0x332/0x1350 net/ipv4/devinet.c:1597 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] dev_close_many+0x29c/0x400 net/core/dev.c:1663 unregister_netdevice_many+0x4b8/0x1a40 net/core/dev.c:11136 default_device_exit_batch+0x364/0x3c0 net/core/dev.c:11693 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x78e/0xba0 net/core/net_namespace.c:635 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Second to last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 kvfree_call_rcu+0x105/0x7f0 kernel/rcu/tree.c:3600 __hw_addr_flush net/core/dev_addr_lists.c:484 [inline] dev_addr_flush+0x165/0x200 net/core/dev_addr_lists.c:513 free_netdev+0x1ec/0x480 net/core/dev.c:11028 netdev_run_todo+0x8d1/0xac0 net/core/dev.c:10719 default_device_exit_batch+0x369/0x3c0 net/core/dev.c:11694 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x78e/0xba0 net/core/net_namespace.c:635 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888060cfc400 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 112 bytes to the right of 128-byte region [ffff888060cfc400, ffff888060cfc480) The buggy address belongs to the page: page:ffffea0001833f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888060cfc600 pfn:0x60cfc flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001833288 ffffea00017cfe88 ffff888016c418c0 raw: ffff888060cfc600 000000000010000e 00000001ffffffff 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 4196, ts 66182070900, free_ts 24322539891 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0xf9/0x290 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] __hw_addr_create net/core/dev_addr_lists.c:29 [inline] __hw_addr_add_ex+0x1ed/0x780 net/core/dev_addr_lists.c:93 __dev_mc_add net/core/dev_addr_lists.c:832 [inline] dev_mc_add+0x91/0x110 net/core/dev_addr_lists.c:850 igmp6_group_added+0x228/0x7c0 net/ipv6/mcast.c:684 __ipv6_dev_mc_inc+0x959/0xb20 net/ipv6/mcast.c:955 ipv6_add_dev+0xce2/0x11a0 net/ipv6/addrconf.c:467 addrconf_notify+0x66f/0xf20 net/ipv6/addrconf.c:3586 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] register_netdevice+0x12a8/0x1720 net/core/dev.c:10454 veth_newlink+0x6af/0xe20 drivers/net/veth.c:1685 __rtnl_newlink net/core/rtnetlink.c:3538 [inline] rtnl_newlink+0x139e/0x1920 net/core/rtnetlink.c:3586 rtnetlink_rcv_msg+0x7f1/0xf10 net/core/rtnetlink.c:5698 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9428 destroy_args+0xef/0xa00 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x321/0x380 mm/debug_vm_pgtable.c:1336 do_one_initcall+0x272/0x730 init/main.c:1315 do_initcall_level+0x13d/0x1f0 init/main.c:1388 do_initcalls+0x4b/0x90 init/main.c:1404 kernel_init_freeable+0x3d5/0x560 init/main.c:1628 kernel_init+0x19/0x1b0 init/main.c:1519 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888060cfc380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060cfc400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc >ffff888060cfc480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888060cfc500: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff888060cfc580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================