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BUG: KASAN: invalid-free in f_uac2_opts_c_srate_store+0x1d4/0x260 drivers/usb/gadget/function/f_uac2.c:2091
Free of addr ffff88807633f126 by task syz.0.3403/19261

CPU: 1 UID: 0 PID: 19261 Comm: syz.0.3403 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 __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_invalid_free+0xb8/0x190 mm/kasan/report.c:557
 check_slab_allocation+0xe1/0xf0 mm/kasan/common.c:230
 kasan_slab_pre_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:2650 [inline]
 slab_free mm/slub.c:6405 [inline]
 kfree+0x1b6/0x6c0 mm/slub.c:6720
 f_uac2_opts_c_srate_store+0x1d4/0x260 drivers/usb/gadget/function/f_uac2.c:2091
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed1759de99
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:00007fed157f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fed17825fa0 RCX: 00007fed1759de99
RDX: 000000000000000f RSI: 0000200000000700 RDI: 0000000000000003
RBP: 00007fed17633eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fed17826038 R14: 00007fed17825fa0 R15: 00007ffc1c511ac8
 </TASK>

Allocated by task 19261:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5362 [inline]
 __kmalloc_node_track_caller_noprof+0x331/0x830 mm/slub.c:5497
 __kmemdup_nul mm/util.c:64 [inline]
 kstrdup+0x51/0xe0 mm/util.c:84
 f_uac2_opts_c_srate_store+0x113/0x260 drivers/usb/gadget/function/f_uac2.c:2091
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88807633f120
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 6 bytes inside of
 16-byte region [ffff88807633f120, ffff88807633f130)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807633f400 pfn:0x7633f
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88813fe22640 ffffea000090ed50 ffffea0000dd0810
raw: ffff88807633f400 0000000800800077 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 0xd2c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 512, tgid 512 (kworker/u8:7), ts 575385154395, free_ts 570335206155
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab mm/slub.c:3408 [inline]
 new_slab+0xa2/0x650 mm/slub.c:3454
 refill_objects+0xe3/0x410 mm/slub.c:7338
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703
 alloc_from_pcs mm/slub.c:4801 [inline]
 slab_alloc_node mm/slub.c:4933 [inline]
 __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5511
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 fuse_folios_alloc fs/fuse/fuse_i.h:876 [inline]
 fuse_writepage_args_alloc fs/fuse/file.c:2078 [inline]
 fuse_writepage_args_setup fs/fuse/file.c:2121 [inline]
 fuse_iomap_writeback_range+0xb00/0x1a10 fs/fuse/file.c:2261
 iomap_writeback_range fs/iomap/buffered-io.c:1862 [inline]
 iomap_writeback_folio+0xc09/0x2730 fs/iomap/buffered-io.c:1988
 iomap_writepages+0x13e/0x2a0 fs/iomap/buffered-io.c:2051
 fuse_writepages+0x270/0x330 fs/fuse/file.c:2324
 do_writepages+0x278/0x600 mm/page-writeback.c:2571
 __writeback_single_inode+0x164/0x1300 fs/fs-writeback.c:1787
 writeback_sb_inodes+0x766/0x1c50 fs/fs-writeback.c:2079
 __writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2155
 wb_writeback+0x6f6/0xb50 fs/fs-writeback.c:2266
page last free pid 189 tgid 189 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
 __pagetable_free include/linux/mm.h:3695 [inline]
 pagetable_free include/linux/mm.h:3719 [inline]
 pagetable_dtor_free include/linux/mm.h:3818 [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:2645 [inline]
 rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2897
 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
 do_softirq kernel/softirq.c:523 [inline]
 do_softirq+0xac/0xe0 kernel/softirq.c:510
 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 ptr_ring_consume_bh include/linux/ptr_ring.h:393 [inline]
 wg_packet_encrypt_worker+0x8f2/0xbd0 drivers/net/wireguard/send.c:293
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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:
 ffff88807633f000: fa fb fc fc fa fb fc fc 00 03 fc fc fa fb fc fc
 ffff88807633f080: fa fb fc fc 00 00 fc fc 00 03 fc fc fa fb fc fc
>ffff88807633f100: 00 00 fc fc 00 00 fc fc fa fb fc fc fa fb fc fc
                               ^
 ffff88807633f180: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
 ffff88807633f200: fa fb fc fc fa fb fc fc 00 00 fc fc fa fb fc fc
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