================================================================== BUG: KASAN: invalid-free in f_uac2_opts_c_srate_store+0x225/0x2b0 drivers/usb/gadget/function/f_uac2.c:2091 Free of addr ffff88801f1f6286 by task syz.0.0/5327 CPU: 0 UID: 0 PID: 5327 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: 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:2622 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x173/0x640 mm/slub.c:6692 f_uac2_opts_c_srate_store+0x225/0x2b0 drivers/usb/gadget/function/f_uac2.c:2091 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x337/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5441d9e019 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:00007f5442d44fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5442025fa0 RCX: 00007f5441d9e019 RDX: 000000000000001c RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f5441e3500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5442026038 R14: 00007f5442025fa0 R15: 00007ffde5c181d8 Allocated by task 5327: 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:5334 [inline] __kmalloc_node_track_caller_noprof+0x4c3/0x730 mm/slub.c:5471 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x42/0x100 mm/util.c:84 f_uac2_opts_c_srate_store+0x11f/0x2b0 drivers/usb/gadget/function/f_uac2.c:2091 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x337/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88801f1f6280 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 6 bytes inside of 29-byte region [ffff88801f1f6280, ffff88801f1f629d) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f1f6 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b041780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800400040 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 1, tgid 1 (swapper/0), ts 3645917307, free_ts 3545170911 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3380 new_slab mm/slub.c:3426 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x3a7/0x660 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] acpi_add_id+0x52/0x1a0 drivers/acpi/scan.c:1335 acpi_set_pnp_ids drivers/acpi/scan.c:1449 [inline] acpi_init_device_object+0x2709/0x2b00 drivers/acpi/scan.c:1821 acpi_add_single_object+0x107/0x1b60 drivers/acpi/scan.c:1872 acpi_bus_check_add+0x2b7/0x8a0 drivers/acpi/scan.c:2173 acpi_ns_walk_namespace+0x273/0x700 drivers/acpi/acpica/nswalk.c:-1 acpi_walk_namespace+0x125/0x190 drivers/acpi/acpica/nsxfeval.c:606 acpi_bus_scan+0x465/0x4f0 drivers/acpi/scan.c:2730 acpi_scan_init+0x1b1/0x470 drivers/acpi/scan.c:2871 acpi_init+0x130/0x1f0 drivers/acpi/bus.c:1605 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950 __slab_free+0x274/0x2c0 mm/slub.c:5741 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_remove_cache+0x1cc/0x360 mm/kasan/quarantine.c:364 kmem_cache_shrink+0xd/0x20 mm/slab_common.c:604 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1622 acpi_purge_cached_objects+0xd5/0x100 drivers/acpi/acpica/utxface.c:240 acpi_initialize_objects+0x2e/0xb0 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init+0xa8/0x360 drivers/acpi/bus.c:1503 acpi_init+0xa1/0x1f0 drivers/acpi/bus.c:1592 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x10a/0x1a0 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 Memory state around the buggy address: ffff88801f1f6180: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc ffff88801f1f6200: 00 00 00 04 fc fc fc fc fa fb fb fb fc fc fc fc >ffff88801f1f6280: 00 00 00 05 fc fc fc fc 00 00 00 01 fc fc fc fc ^ ffff88801f1f6300: 00 00 00 03 fc fc fc fc 00 00 04 fc fc fc fc fc ffff88801f1f6380: 00 00 00 00 fc fc fc fc 00 00 00 01 fc fc fc fc ==================================================================