================================================================== BUG: KASAN: invalid-free in f_uac2_opts_p_srate_store+0x1d4/0x260 drivers/usb/gadget/function/f_uac2.c:2087 Free of addr ffff88803b595388 by task syz.5.1548/10400 CPU: 0 UID: 0 PID: 10400 Comm: syz.5.1548 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __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:2622 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x1b6/0x6c0 mm/slub.c:6692 f_uac2_opts_p_srate_store+0x1d4/0x260 drivers/usb/gadget/function/f_uac2.c:2087 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+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9b31d9e0d9 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:00007f9b32c2d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9b32025fa0 RCX: 00007f9b31d9e0d9 RDX: 000000000000003c RSI: 0000200000000580 RDI: 0000000000000005 RBP: 00007f9b31e35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9b32026038 R14: 00007f9b32025fa0 R15: 00007ffe524dceb8 Allocated by task 10400: 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:5334 [inline] __kmalloc_node_track_caller_noprof+0x333/0x830 mm/slub.c:5471 __kmemdup_nul mm/util.c:64 [inline] kstrdup+0x51/0xe0 mm/util.c:84 f_uac2_opts_p_srate_store+0x113/0x260 drivers/usb/gadget/function/f_uac2.c:2087 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+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803b595380 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 30-byte region [ffff88803b595380, ffff88803b59539e) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3b595 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c042780 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5147, tgid 5147 (udevd), ts 25089508092, free_ts 25089354522 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+0xf46/0x3500 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x660 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x372/0x680 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x47b/0x6b0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] slab_free_hook mm/slub.c:2629 [inline] slab_free mm/slub.c:6377 [inline] kmem_cache_free+0x40f/0x6b0 mm/slub.c:6504 file_free fs/file_table.c:104 [inline] __fput+0x68d/0xb50 fs/file_table.c:525 fput_close_sync+0x118/0x250 fs/file_table.c:617 __do_sys_close fs/open.c:1560 [inline] __se_sys_close fs/open.c:1545 [inline] __x64_sys_close+0x8b/0x120 fs/open.c:1545 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5147 tgid 5147 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 free_pipe_info+0x2ff/0x460 fs/pipe.c:945 put_pipe_info fs/pipe.c:804 [inline] pipe_release+0x27a/0x2c0 fs/pipe.c:827 __fput+0x3ff/0xb50 fs/file_table.c:512 fput_close_sync+0x118/0x250 fs/file_table.c:617 __do_sys_close fs/open.c:1560 [inline] __se_sys_close fs/open.c:1545 [inline] __x64_sys_close+0x8b/0x120 fs/open.c:1545 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803b595280: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88803b595300: 00 00 00 00 fc fc fc fc 00 00 00 fc fc fc fc fc >ffff88803b595380: 00 00 00 06 fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff88803b595400: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ffff88803b595480: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================