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 ffff888075bc43f0 by task syz.0.218/5032

CPU: 1 PID: 5032 Comm: syz.0.218 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 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: 0033:0x7effb120ae99
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:00007effaf463028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007effb1492fa0 RCX: 00007effb120ae99
RDX: 000000000000000b RSI: 0000200000000880 RDI: 0000000000000003
RBP: 00007effb12a0eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007effb1493038 R14: 00007effb1492fa0 R15: 00007ffcc2f35ca8
 </TASK>

Allocated by task 7:
 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

The buggy address belongs to the object at ffff888075bc4300
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 112 bytes to the right of
 128-byte region [ffff888075bc4300, ffff888075bc4380)
The buggy address belongs to the page:
page:ffffea0001d6f100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888075bc4c00 pfn:0x75bc4
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0001eafec0 0000000c0000000c ffff888016c418c0
raw: ffff888075bc4c00 000000008010000d 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3559, ts 95911999419, free_ts 95608100925
 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]
 kernfs_get_open_node fs/kernfs/file.c:552 [inline]
 kernfs_fop_open+0x887/0xba0 fs/kernfs/file.c:698
 do_dentry_open+0x7f7/0xf90 fs/open.c:826
 do_open fs/namei.c:3616 [inline]
 path_openat+0x2718/0x2fb0 fs/namei.c:3750
 do_filp_open+0x1df/0x400 fs/namei.c:3777
 do_sys_openat2+0x14b/0x500 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 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
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_list+0x119/0x830 mm/page_alloc.c:3433
 release_pages+0x185f/0x1bd0 mm/swap.c:963
 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:241 [inline]
 tlb_flush_mmu mm/mmu_gather.c:248 [inline]
 tlb_finish_mmu+0x1b4/0x370 mm/mmu_gather.c:371
 exit_mmap+0x3d0/0x640 mm/mmap.c:3218
 __mmput+0x115/0x390 kernel/fork.c:1128
 exit_mm+0x632/0x7b0 kernel/exit.c:551
 do_exit+0x5b8/0x2110 kernel/exit.c:871
 do_group_exit+0x12c/0x2f0 kernel/exit.c:998
 get_signal+0x7eb/0x12e0 kernel/signal.c:2901
 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff888075bc4280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888075bc4300: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
>ffff888075bc4380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff888075bc4400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
 ffff888075bc4480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================