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BUG: KASAN: invalid-free in f_uac2_opts_c_srate_store+0x224/0x2b0 drivers/usb/gadget/function/f_uac2.c:2091
Free of addr ffff88810b36fe06 by task syz-executor396/312

CPU: 0 UID: 0 PID: 312 Comm: syz-executor396 Not tainted syzkaller #0 91781886e4a1baa38ce9d8cd537274748dd3a26f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 print_address_description+0x71/0x210 mm/kasan/report.c:377
 print_report+0x4a/0x70 mm/kasan/report.c:481
 kasan_report_invalid_free+0x11e/0x160 mm/kasan/report.c:556
 check_slab_allocation+0xdf/0xf0 include/linux/page-flags.h:-1
 __kasan_slab_pre_free+0x36/0x50 mm/kasan/common.c:257
 kasan_slab_pre_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:2390 [inline]
 slab_free mm/slub.c:4714 [inline]
 kfree+0xf8/0x440 mm/slub.c:4875
 f_uac2_opts_c_srate_store+0x224/0x2b0 drivers/usb/gadget/function/f_uac2.c:2091
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x32f/0x490 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb5831eccf9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffded283a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007fb5831eccf9
RDX: 000000000000006e RSI: 0000200000000280 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffded283b38
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffded283b28
R13: 0000000000000002 R14: 00007fb58327dca0 R15: 0000000000000002
 </TASK>

Allocated by task 312:
 kasan_save_stack mm/kasan/common.c:49 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
 kasan_save_alloc_info+0x3a/0x50 mm/kasan/generic.c:565
 poison_kmalloc_redzone mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:396
 kasan_kmalloc include/linux/kasan.h:261 [inline]
 __do_kmalloc_node mm/slub.c:4395 [inline]
 __kmalloc_node_track_caller_noprof+0x24e/0x4f0 mm/slub.c:4414
 kstrdup+0x4d/0x130 mm/util.c:70
 f_uac2_opts_c_srate_store+0x11e/0x2b0 drivers/usb/gadget/function/f_uac2.c:2091
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x32f/0x490 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

The buggy address belongs to the object at ffff88810b36fe00
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 6 bytes inside of
 111-byte region [ffff88810b36fe00, ffff88810b36fe6f)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b36f
flags: 0x4000000000000000(zone=1)
page_type: f5(slab)
raw: 4000000000000000 ffff888100041a00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 80, tgid 80 (mount), ts 4868838250, free_ts 4868495179
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1863
 prep_new_page+0x2d/0x180 mm/page_alloc.c:1871
 get_page_from_freelist+0x4aea/0x4ba0 mm/page_alloc.c:3948
 __alloc_pages_noprof+0x35a/0x7e0 mm/page_alloc.c:5315
 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1
 allocate_slab+0x69/0x430 mm/slub.c:2687
 new_slab mm/slub.c:2741 [inline]
 ___slab_alloc+0x591/0x8c0 mm/slub.c:3934
 __slab_alloc mm/slub.c:4025 [inline]
 __slab_alloc_node mm/slub.c:4078 [inline]
 slab_alloc_node mm/slub.c:4239 [inline]
 __kmalloc_cache_noprof+0x2cd/0x470 mm/slub.c:4421
 kmalloc_noprof include/linux/slab.h:881 [inline]
 kzalloc_noprof include/linux/slab.h:1017 [inline]
 shrinker_alloc+0x68/0xa60 mm/shrinker.c:696
 alloc_super+0x602/0x950 fs/super.c:382
 sget+0x1fb/0x710 fs/super.c:858
 mount_single+0x3f/0x1e0 fs/super.c:1783
 pstore_mount+0x30/0x40 fs/pstore/inode.c:444
 legacy_get_tree+0x103/0x1b0 fs/fs_context.c:662
 vfs_get_tree+0x9e/0x290 fs/super.c:1820
 do_new_mount+0x251/0xb40 fs/namespace.c:3567
page last free pid 80 tgid 80 stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1390 [inline]
 free_unref_page+0xbb8/0xf70 mm/page_alloc.c:2876
 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5402
 free_pages+0x86/0x90 mm/page_alloc.c:5415
 selinux_genfs_get_sid+0x209/0x2d0 security/selinux/hooks.c:1362
 inode_doinit_with_dentry+0x8f8/0xde0 security/selinux/hooks.c:1560
 selinux_d_instantiate+0x2b/0x40 security/selinux/hooks.c:6361
 security_d_instantiate+0xb8/0xf0 security/security.c:4068
 d_splice_alias+0x71/0x3a0 fs/dcache.c:2949
 kernfs_iop_lookup+0x2c6/0x320 fs/kernfs/dir.c:1233
 __lookup_slow+0x2e2/0x420 fs/namei.c:1740
 lookup_slow+0x57/0x80 fs/namei.c:1757
 walk_component+0x308/0x450 fs/namei.c:2061
 lookup_last fs/namei.c:2564 [inline]
 path_lookupat+0x155/0x440 fs/namei.c:2588
 filename_lookup+0x22d/0x5a0 fs/namei.c:2617
 vfs_statx+0x106/0x210 fs/stat.c:312
 vfs_fstatat+0xe5/0x1d0 fs/stat.c:341

Memory state around the buggy address:
 ffff88810b36fd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810b36fd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810b36fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 07 fc fc
                   ^
 ffff88810b36fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810b36ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
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