=====================================================
BUG: KMSAN: uninit-value in memcmp lib/string.c:692 [inline]
BUG: KMSAN: uninit-value in bcmp+0x186/0x1c0 lib/string.c:713
 memcmp lib/string.c:692 [inline]
 bcmp+0x186/0x1c0 lib/string.c:713
 line6_pod_process_message+0x3c7/0x7b0 sound/usb/line6/pod.c:198
 line6_data_received+0x5da/0x7e0 sound/usb/line6/driver.c:317
 __usb_hcd_giveback_urb+0x521/0x750 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x158/0x680 drivers/usb/core/hcd.c:1733
 dummy_timer+0xd65/0x4c30 drivers/usb/gadget/udc/dummy_hcd.c:1987
 call_timer_fn+0x45/0x570 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x80b/0xe90 kernel/time/timer.c:2038
 run_timer_softirq+0x26/0x40 kernel/time/timer.c:2051
 __do_softirq+0x1b7/0x7c3 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0x69/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x7a/0x90 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:649
 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x25/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 shmem_add_to_page_cache+0xa09/0xd60 mm/shmem.c:798
 shmem_alloc_and_add_folio+0x6ba/0x1250 mm/shmem.c:1691
 shmem_get_folio_gfp+0x941/0x2290 mm/shmem.c:2054
 shmem_get_folio mm/shmem.c:2136 [inline]
 shmem_write_begin+0x14f/0x490 mm/shmem.c:2719
 generic_perform_write+0x3f5/0xc40 mm/filemap.c:3927
 shmem_file_write_iter+0x2b5/0x2e0 mm/shmem.c:2895
 call_write_iter include/linux/fs.h:2084 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x786/0x1200 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xd0 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x6d/0x140 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
 slab_alloc_node mm/slub.c:3478 [inline]
 __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
 kmalloc_trace+0x51/0x200 mm/slab_common.c:1098
 kmalloc include/linux/slab.h:600 [inline]
 line6_init_cap_control+0x4f1/0x770 sound/usb/line6/driver.c:700
 line6_probe+0xea8/0x1110 sound/usb/line6/driver.c:797
 pod_probe+0x79/0x90 sound/usb/line6/pod.c:522
 usb_probe_interface+0xc75/0x1210 drivers/usb/core/driver.c:396
 really_probe+0x506/0xf40 drivers/base/dd.c:658
 __driver_probe_device+0x2a7/0x5d0 drivers/base/dd.c:800
 driver_probe_device+0x72/0x7b0 drivers/base/dd.c:830
 __device_attach_driver+0x55a/0x8f0 drivers/base/dd.c:958
 bus_for_each_drv+0x3ff/0x620 drivers/base/bus.c:457
 __device_attach+0x3bd/0x640 drivers/base/dd.c:1030
 device_initial_probe+0x32/0x40 drivers/base/dd.c:1079
 bus_probe_device+0x3d8/0x5a0 drivers/base/bus.c:532
 device_add+0x1700/0x1f20 drivers/base/core.c:3625
 usb_set_configuration+0x31c9/0x38c0 drivers/usb/core/message.c:2207
 usb_generic_driver_probe+0x109/0x2a0 drivers/usb/core/generic.c:238
 usb_probe_device+0x290/0x4a0 drivers/usb/core/driver.c:293
 really_probe+0x506/0xf40 drivers/base/dd.c:658
 __driver_probe_device+0x2a7/0x5d0 drivers/base/dd.c:800
 driver_probe_device+0x72/0x7b0 drivers/base/dd.c:830
 __device_attach_driver+0x55a/0x8f0 drivers/base/dd.c:958
 bus_for_each_drv+0x3ff/0x620 drivers/base/bus.c:457
 __device_attach+0x3bd/0x640 drivers/base/dd.c:1030
 device_initial_probe+0x32/0x40 drivers/base/dd.c:1079
 bus_probe_device+0x3d8/0x5a0 drivers/base/bus.c:532
 device_add+0x1700/0x1f20 drivers/base/core.c:3625
 usb_new_device+0x15fc/0x23e0 drivers/usb/core/hub.c:2576
 hub_port_connect drivers/usb/core/hub.c:5440 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
 port_event drivers/usb/core/hub.c:5740 [inline]
 hub_event+0x53bc/0x7290 drivers/usb/core/hub.c:5822
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2706
 worker_thread+0xf45/0x1490 kernel/workqueue.c:2787
 kthread+0x3ed/0x540 kernel/kthread.c:388
 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

CPU: 1 PID: 6358 Comm: syz-executor.2 Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================