================================================================== BUG: KASAN: invalid-free in f_uac2_opts_p_srate_store+0x224/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087 Free of addr ffff8881301aec1a by task syz.0.373/1577 CPU: 1 UID: 0 PID: 1577 Comm: syz.0.373 Not tainted syzkaller #0 0b31bef96cff8e44f9e14c4f768eb06c85e3b290 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __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_p_srate_store+0x224/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087 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: 0033:0x7f912059df99 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:00007f9121414028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9120825fa0 RCX: 00007f912059df99 RDX: 000000000000001b RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f9120634ec4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9120826038 R14: 00007f9120825fa0 R15: 00007ffffa6d7958 Allocated by task 1577: 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_p_srate_store+0x11e/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087 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 ffff8881301aec00 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 26 bytes inside of 28-byte region [ffff8881301aec00, ffff8881301aec1c) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1301ae anon flags: 0x4000000000000000(zone=1) page_type: f5(slab) raw: 4000000000000000 ffff888100041780 ffffea00045218c0 dead000000000003 raw: 0000000000000000 0000000080400040 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 295, tgid 295 (syz-executor), ts 22711650584, free_ts 0 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] ref_tracker_alloc+0x181/0x5b0 lib/ref_tracker.c:203 __netdev_tracker_alloc include/linux/netdevice.h:4142 [inline] netdev_hold include/linux/netdevice.h:4171 [inline] ipv6_add_dev+0x3f3/0x1410 net/ipv6/addrconf.c:409 addrconf_notify+0x56e/0xeb0 net/ipv6/addrconf.c:3693 notifier_call_chain+0x106/0x2b0 kernel/notifier.c:93 raw_notifier_call_chain+0x31/0x40 kernel/notifier.c:461 call_netdevice_notifiers_info net/core/dev.c:2074 [inline] call_netdevice_notifiers_extack net/core/dev.c:2112 [inline] call_netdevice_notifiers+0x11d/0x1a0 net/core/dev.c:2126 register_netdevice+0x12d7/0x1a80 net/core/dev.c:10654 veth_newlink+0x5e0/0xc40 drivers/net/veth.c:1872 page_owner free stack trace missing Memory state around the buggy address: ffff8881301aeb00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff8881301aeb80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff8881301aec00: 00 00 00 04 fc fc fc fc 00 00 00 00 fc fc fc fc ^ ffff8881301aec80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff8881301aed00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================