================================================================== BUG: KASAN: invalid-free in slab_free mm/slub.c:3712 [inline] BUG: KASAN: invalid-free in __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728 Free of addr ffff8881388ea82e by task syz.2.823/3384 CPU: 0 PID: 3384 Comm: syz.2.823 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report_invalid_free+0xd5/0xf0 mm/kasan/report.c:489 ____kasan_slab_free+0x14f/0x180 mm/kasan/common.c:-1 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728 kfree+0x6f/0xf0 mm/slab_common.c:990 f_uac2_opts_p_srate_store+0x220/0x2a0 drivers/usb/gadget/function/f_uac2.c:2078 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x323/0x410 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f871019e0d9 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:00007f87110f3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8710425fa0 RCX: 00007f871019e0d9 RDX: 000000000000002f RSI: 0000200000000000 RDI: 0000000000000006 RBP: 00007f8710235024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8710426038 R14: 00007f8710425fa0 R15: 00007ffc86e3a618 Allocated by task 3384: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958 kstrdup+0x3b/0x80 mm/util.c:66 f_uac2_opts_p_srate_store+0x11a/0x2a0 drivers/usb/gadget/function/f_uac2.c:2078 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x323/0x410 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8881388ea800 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 46 bytes inside of 64-byte region [ffff8881388ea800, ffff8881388ea840) The buggy address belongs to the physical page: page:ffffea0004e23a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1388ea flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004cf59c0 dead000000000003 ffff888100042780 raw: 0000000000000000 0000000080200020 00000001ffffffff 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 287, tgid 287 (syz-executor), ts 28366256739, free_ts 28366231252 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423 kmalloc_node_trace+0x26/0xb0 mm/slab_common.c:1041 kmalloc_node include/linux/slab.h:585 [inline] kzalloc_node include/linux/slab.h:710 [inline] __get_vm_area_node+0x12c/0x360 mm/vmalloc.c:2515 __vmalloc_node_range+0x326/0x1440 mm/vmalloc.c:3216 __vmalloc_node mm/vmalloc.c:3321 [inline] vzalloc+0x78/0x90 mm/vmalloc.c:3394 alloc_counters+0x66/0x530 net/ipv4/netfilter/arp_tables.c:660 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:839 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0xa84/0x11b0 net/ipv6/netfilter/ip6_tables.c:1679 nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1580 [inline] free_pcp_prepare mm/page_alloc.c:1654 [inline] free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page+0x93/0x530 mm/page_alloc.c:3719 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6020 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739 __vfree mm/vmalloc.c:2788 [inline] vfree+0x61/0x90 mm/vmalloc.c:2819 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0xe91/0x11b0 net/ipv6/netfilter/ip6_tables.c:1679 nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x230/0x2d0 net/ipv6/ipv6_sockglue.c:1513 tcp_getsockopt+0xff/0x130 net/ipv4/tcp.c:4463 sock_common_getsockopt+0xaa/0xc0 net/core/sock.c:3680 __sys_getsockopt+0x215/0x490 net/socket.c:2321 __do_sys_getsockopt net/socket.c:2336 [inline] __se_sys_getsockopt net/socket.c:2333 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2333 x64_sys_call+0x3d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8881388ea700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881388ea780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff8881388ea800: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881388ea880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881388ea900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================