syzbot

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BUG: KMSAN: uninit-value in hex_string+0x681/0x740 lib/vsprintf.c:1220
 hex_string+0x681/0x740 lib/vsprintf.c:1220
 pointer+0x2c7/0x1b70 lib/vsprintf.c:2520
 vsnprintf+0xf8a/0x1b20 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+0xed0/0x3110 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x300/0x4a0 drivers/i2c/i2c-core-base.c:2317
 i2c_transfer_buffer_flags+0x138/0x200 drivers/i2c/i2c-core-base.c:2345
 i2c_master_recv include/linux/i2c.h:79 [inline]
 i2cdev_read+0x1b2/0x3c0 drivers/i2c/i2c-dev.c:155
 vfs_read+0x27c/0xf90 fs/read_write.c:570
 ksys_pread64 fs/read_write.c:763 [inline]
 __do_sys_pread64 fs/read_write.c:771 [inline]
 __se_sys_pread64 fs/read_write.c:768 [inline]
 __x64_sys_pread64+0x2ab/0x3b0 fs/read_write.c:768
 x64_sys_call+0x305b/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:18
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 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:4985 [inline]
 slab_alloc_node mm/slub.c:5288 [inline]
 __kmalloc_cache_noprof+0x8f5/0x16b0 mm/slub.c:5766
 kmalloc_noprof include/linux/slab.h:957 [inline]
 pctv452e_i2c_msg+0x98/0x8f0 drivers/media/usb/dvb-usb/pctv452e.c:425
 pctv452e_i2c_xfer+0x2e6/0x4c0 drivers/media/usb/dvb-usb/pctv452e.c:502
 __i2c_transfer+0xed0/0x3110 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x300/0x4a0 drivers/i2c/i2c-core-base.c:2317
 i2c_transfer_buffer_flags+0x138/0x200 drivers/i2c/i2c-core-base.c:2345
 i2c_master_recv include/linux/i2c.h:79 [inline]
 i2cdev_read+0x1b2/0x3c0 drivers/i2c/i2c-dev.c:155
 vfs_read+0x27c/0xf90 fs/read_write.c:570
 ksys_pread64 fs/read_write.c:763 [inline]
 __do_sys_pread64 fs/read_write.c:771 [inline]
 __se_sys_pread64 fs/read_write.c:768 [inline]
 __x64_sys_pread64+0x2ab/0x3b0 fs/read_write.c:768
 x64_sys_call+0x305b/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:18
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 16043 Comm: syz.3.3410 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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