=====================================================
BUG: KMSAN: uninit-value in hex_string+0x681/0x740 lib/vsprintf.c:1220
 hex_string+0x681/0x740 lib/vsprintf.c:1220
 pointer+0x2c7/0x1bd0 lib/vsprintf.c:2520
 vsnprintf+0xf8a/0x1bd0 lib/vsprintf.c:2930
 vscnprintf+0x6d/0x120 lib/vsprintf.c:2991
 printk_sprint+0x53/0x5c0 kernel/printk/printk.c:2189
 vprintk_store+0xbb9/0x1530 kernel/printk/printk.c:2309
 vprintk_emit+0x21a/0xb60 kernel/printk/printk.c:2399
 vprintk_default+0x3f/0x50 kernel/printk/printk.c:2438
 vprintk+0x36/0x50 kernel/printk/printk_safe.c:82
 _printk+0x17e/0x1b0 kernel/printk/printk.c:2448
 pctv452e_i2c_msg+0x82a/0x8f0 drivers/media/usb/dvb-usb/pctv452e.c:467
 pctv452e_i2c_xfer+0x2e6/0x4c0 drivers/media/usb/dvb-usb/pctv452e.c:502
 __i2c_transfer+0xecd/0x3110 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x300/0x4b0 drivers/i2c/i2c-core-base.c:2317
 i2c_transfer_buffer_flags+0x138/0x200 drivers/i2c/i2c-core-base.c:2345
 i2c_master_send include/linux/i2c.h:109 [inline]
 i2cdev_write+0x214/0x2b0 drivers/i2c/i2c-dev.c:183
 do_loop_readv_writev fs/read_write.c:850 [inline]
 vfs_writev+0xb34/0x1500 fs/read_write.c:1059
 do_writev+0x1b5/0x580 fs/read_write.c:1103
 __do_sys_writev fs/read_write.c:1171 [inline]
 __se_sys_writev fs/read_write.c:1168 [inline]
 __x64_sys_writev+0x99/0xf0 fs/read_write.c:1168
 x64_sys_call+0x24b1/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:21
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4962 [inline]
 slab_alloc_node mm/slub.c:5265 [inline]
 __kmalloc_cache_noprof+0x8f5/0x16b0 mm/slub.c:5743
 kmalloc_noprof include/linux/slab.h:957 [inline]
 pctv452e_i2c_msg+0x98/0x8f0 drivers/media/usb/dvb-usb/pctv452e.c:425
 pctv452e_read_mac_address+0xf5/0x2d0 drivers/media/usb/dvb-usb/pctv452e.c:629
 dvb_usb_adapter_dvb_init+0xa1a/0x1050 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:165
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:86 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline]
 dvb_usb_device_init+0x273f/0x3980 drivers/media/usb/dvb-usb/dvb-usb-init.c:310
 pctv452e_usb_probe+0xb6/0x150 drivers/media/usb/dvb-usb/pctv452e.c:1094
 usb_probe_interface+0xd23/0x1460 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d4/0xdc0 drivers/base/dd.c:659
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:801
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:831
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:959
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1031
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1080
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3689
 usb_set_configuration+0x3493/0x3b70 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xfc/0x290 drivers/usb/core/generic.c:250
 usb_probe_device+0x38d/0x690 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d4/0xdc0 drivers/base/dd.c:659
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:801
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:831
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:959
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1031
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1080
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3689
 usb_new_device+0x1062/0x20f0 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x54e0/0x7620 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3346
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427
 kthread+0xd5c/0xf00 kernel/kthread.c:463
 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

CPU: 0 UID: 0 PID: 31286 Comm: syz.0.9190 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
=====================================================