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BUG: KASAN: invalid-free in f_uac2_opts_p_srate_store+0x225/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087
Free of addr ffff888042facc29 by task syz.0.0/5313

CPU: 0 UID: 0 PID: 5313 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report_invalid_free+0xea/0x110 mm/kasan/report.c:557
 check_slab_allocation mm/kasan/common.c:-1 [inline]
 __kasan_slab_pre_free+0x104/0x120 mm/kasan/common.c:261
 kasan_slab_pre_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:2623 [inline]
 slab_free mm/slub.c:6372 [inline]
 kfree+0x173/0x640 mm/slub.c:6687
 f_uac2_opts_p_srate_store+0x225/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x337/0x430 fs/configfs/file.c:229
 do_iter_readv_writev+0x612/0x8c0 fs/read_write.c:-1
 vfs_writev+0x343/0x990 fs/read_write.c:1058
 do_pwritev fs/read_write.c:1154 [inline]
 __do_sys_pwritev fs/read_write.c:1200 [inline]
 __se_sys_pwritev fs/read_write.c:1195 [inline]
 __x64_sys_pwritev+0x19c/0x2b0 fs/read_write.c:1195
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f107ed9e0d9
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:00007f107fc1afe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: 00007f107f025fa0 RCX: 00007f107ed9e0d9
RDX: 0000000000000008 RSI: 0000200000000940 RDI: 0000000000000004
RBP: 00007f107ee35024 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f107f026038 R14: 00007f107f025fa0 R15: 00007fffc7329e28
 </TASK>

Allocated by task 5313:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5337 [inline]
 __kmalloc_node_track_caller_noprof+0x4c7/0x740 mm/slub.c:5466
 __kmemdup_nul mm/util.c:64 [inline]
 kstrdup+0x42/0x100 mm/util.c:84
 f_uac2_opts_p_srate_store+0x11f/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x337/0x430 fs/configfs/file.c:229
 do_iter_readv_writev+0x612/0x8c0 fs/read_write.c:-1
 vfs_writev+0x343/0x990 fs/read_write.c:1058
 do_pwritev fs/read_write.c:1154 [inline]
 __do_sys_pwritev fs/read_write.c:1200 [inline]
 __se_sys_pwritev fs/read_write.c:1195 [inline]
 __x64_sys_pwritev+0x19c/0x2b0 fs/read_write.c:1195
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888042facc00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 41 bytes inside of
 221-byte region [ffff888042facc00, ffff888042faccdd)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42fac
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801b041b40 dead000000000122 0000000000000000
raw: 0000000000000000 0000000800080008 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5272, tgid 5272 (syz-executor), ts 92330446659
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3267 [inline]
 allocate_slab+0x7c/0x5e0 mm/slub.c:3382
 new_slab mm/slub.c:3428 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7305
 refill_sheaf mm/slub.c:2805 [inline]
 __pcs_replace_empty_main+0x2c3/0x6b0 mm/slub.c:4677
 alloc_from_pcs mm/slub.c:4775 [inline]
 slab_alloc_node mm/slub.c:4907 [inline]
 __do_kmalloc_node mm/slub.c:5336 [inline]
 __kmalloc_flags_noprof+0x5c2/0x810 mm/slub.c:5523
 _kmalloc_flags_noprof mm/slab.h:39 [inline]
 alloc_slab_obj_exts+0x4d/0x170 mm/slub.c:2150
 __memcg_slab_post_alloc_hook+0x5d4/0xf10 mm/memcontrol.c:3589
 memcg_slab_post_alloc_hook mm/slub.c:2448 [inline]
 slab_post_alloc_hook mm/slub.c:4605 [inline]
 slab_alloc_node mm/slub.c:4919 [inline]
 __do_kmalloc_node mm/slub.c:5336 [inline]
 __kvmalloc_node_noprof+0x620/0x870 mm/slub.c:6900
 allocate_hook_entries_size net/netfilter/core.c:54 [inline]
 nf_hook_entries_grow+0x287/0x740 net/netfilter/core.c:133
 nf_hook_entries_insert_raw+0x4b/0x320 net/netfilter/core.c:197
 nf_nat_register_fn+0x1e3/0x580 net/netfilter/nf_nat_core.c:1247
 ipt_nat_register_lookups net/ipv4/netfilter/iptable_nat.c:77 [inline]
 iptable_nat_table_init+0x1a9/0x300 net/ipv4/netfilter/iptable_nat.c:121
 xt_find_table_lock+0x311/0x400 net/netfilter/x_tables.c:1353
 xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1378
page last free pid 5272 tgid 5272 ts 92329889524 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 ___free_pages_bulk mm/kasan/shadow.c:333 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
 __kasan_populate_vmalloc+0x12d/0x1c0 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0xd1a/0x1420 mm/vmalloc.c:2146
 __get_vm_area_node+0x200/0x2f0 mm/vmalloc.c:3249
 __vmalloc_node_range_noprof+0x34e/0x1560 mm/vmalloc.c:4065
 __vmalloc_node_noprof mm/vmalloc.c:4166 [inline]
 vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4244
 alloc_counters+0x63/0x5c0 net/ipv4/netfilter/ip_tables.c:799
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:821 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1020 [inline]
 do_ipt_get_ctl+0xb3c/0x1300 net/ipv4/netfilter/ip_tables.c:1669
 nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x19e/0x230 net/ipv4/ip_sockglue.c:1777
 do_sock_getsockopt+0x569/0xa70 net/socket.c:2503
 __sys_getsockopt net/socket.c:2534 [inline]
 __do_sys_getsockopt net/socket.c:2541 [inline]
 __se_sys_getsockopt net/socket.c:2538 [inline]
 __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2538
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042facb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888042facb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888042facc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                  ^
 ffff888042facc80: 00 00 00 00 00 00 00 00 00 00 00 05 fc fc fc fc
 ffff888042facd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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