================================================================== BUG: KASAN: double-free in dev_free+0x424/0x740 drivers/usb/gadget/legacy/raw_gadget.c:226 Free of addr ffff888049a1c7e0 by task syz.8.3380/23768 CPU: 1 UID: 0 PID: 23768 Comm: syz.8.3380 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:2634 [inline] slab_free mm/slub.c:6242 [inline] kfree+0x173/0x640 mm/slub.c:6557 dev_free+0x424/0x740 drivers/usb/gadget/legacy/raw_gadget.c:226 kref_put include/linux/kref.h:65 [inline] raw_release+0x199/0x260 drivers/usb/gadget/legacy/raw_gadget.c:474 __fput+0x451/0x8c0 fs/file_table.c:500 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x926/0x2490 kernel/exit.c:974 do_group_exit+0x21b/0x2d0 kernel/exit.c:1116 get_signal+0x1284/0x1330 kernel/signal.c:3036 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb1e575cfce Code: Unable to access opcode bytes at 0x7fb1e575cfa4. RSP: 002b:00007fb1e65cbf78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6 RAX: fffffffffffffdfc RBX: 00007fb1e65cc6c0 RCX: 00007fb1e575cfce RDX: 00007fb1e65cbfd0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fb1e5832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb1e5a16038 R14: 00007fb1e5a15fa0 R15: 00007ffe224b9cb8 Allocated by task 23773: 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:5292 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5400 memdup_user+0x2b/0xd0 mm/util.c:221 raw_ioctl_ep_enable drivers/usb/gadget/legacy/raw_gadget.c:848 [inline] raw_ioctl+0xdc5/0x41c0 drivers/usb/gadget/legacy/raw_gadget.c:1319 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23768: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6242 [inline] kfree+0x1c5/0x640 mm/slub.c:6557 dev_free+0x424/0x740 drivers/usb/gadget/legacy/raw_gadget.c:226 kref_put include/linux/kref.h:65 [inline] raw_release+0x199/0x260 drivers/usb/gadget/legacy/raw_gadget.c:474 __fput+0x451/0x8c0 fs/file_table.c:500 fput_close_sync+0x11f/0x240 fs/file_table.c:605 __do_sys_close fs/open.c:1509 [inline] __se_sys_close fs/open.c:1494 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1494 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888049a1c7e0 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes inside of 16-byte region [ffff888049a1c7e0, ffff888049a1c7f0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888049a1cd60 pfn:0x49a1c flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801b041640 ffffea0000c63590 ffffea0000ae3d10 raw: ffff888049a1cd60 000000080080006f 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 17478, tgid 17477 (syz.2.2109), ts 1143246103783, free_ts 1143039730432 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x2418/0x24b0 mm/page_alloc.c:3926 __alloc_frozen_pages_noprof+0x233/0x3d0 mm/page_alloc.c:5213 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x339/0x3d0 mm/slub.c:7247 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] __kmalloc_cache_noprof+0x392/0x660 mm/slub.c:5407 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] uapi_add_elm drivers/infiniband/core/uverbs_uapi.c:24 [inline] uapi_merge_method drivers/infiniband/core/uverbs_uapi.c:155 [inline] uapi_merge_obj_tree drivers/infiniband/core/uverbs_uapi.c:214 [inline] uapi_merge_def+0x1225/0x1890 drivers/infiniband/core/uverbs_uapi.c:297 uapi_merge_def+0x2a7/0x1890 drivers/infiniband/core/uverbs_uapi.c:286 uverbs_alloc_api+0x1a6/0x1a60 drivers/infiniband/core/uverbs_uapi.c:658 ib_uverbs_create_uapi drivers/infiniband/core/uverbs_main.c:1138 [inline] ib_uverbs_add_one+0x40f/0x700 drivers/infiniband/core/uverbs_main.c:1194 add_client_context+0x37c/0x7a0 drivers/infiniband/core/device.c:730 enable_device_and_get+0x19c/0x3e0 drivers/infiniband/core/device.c:1340 ib_register_device+0x110f/0x13e0 drivers/infiniband/core/device.c:1459 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline] siw_newlink+0x8fe/0xde0 drivers/infiniband/sw/siw/siw_main.c:430 nldev_newlink+0x5bc/0x650 drivers/infiniband/core/nldev.c:1812 page last free pid 5921 tgid 5921 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2944 vfree+0x1d1/0x2f0 mm/vmalloc.c:3472 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3392 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3288 process_scheduled_works kernel/workqueue.c:3379 [inline] worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888049a1c680: fa fb fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc ffff888049a1c700: fa fb fc fc 00 00 fc fc fa fb fc fc fa fb fc fc >ffff888049a1c780: 00 00 fc fc 00 07 fc fc 00 00 fc fc fa fb fc fc ^ ffff888049a1c800: 00 00 fc fc 00 06 fc fc 00 00 fc fc 00 00 fc fc ffff888049a1c880: 00 00 fc fc 00 00 fc fc fa fb fc fc fa fb fc fc ==================================================================