syzbot

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BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:169 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x420/0x1d00 lib/iov_iter.c:536
 instrument_copy_to_user include/linux/instrumented.h:114 [inline]
 copyout lib/iov_iter.c:169 [inline]
 _copy_to_iter+0x420/0x1d00 lib/iov_iter.c:536
 copy_to_iter include/linux/uio.h:206 [inline]
 kernfs_file_read_iter fs/kernfs/file.c:261 [inline]
 kernfs_fop_read_iter+0x578/0x970 fs/kernfs/file.c:280
 call_read_iter include/linux/fs.h:1862 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x933/0xe40 fs/read_write.c:470
 ksys_read+0x20f/0x4c0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x93/0xd0 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was stored to memory at:
 read_descriptors+0x331/0x560 drivers/usb/core/sysfs.c:889
 sysfs_kf_bin_read+0x33d/0x400 fs/sysfs/file.c:97
 kernfs_file_read_iter fs/kernfs/file.c:251 [inline]
 kernfs_fop_read_iter+0x45b/0x970 fs/kernfs/file.c:280
 call_read_iter include/linux/fs.h:1862 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x933/0xe40 fs/read_write.c:470
 ksys_read+0x20f/0x4c0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x93/0xd0 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:716
 slab_alloc_node mm/slub.c:3451 [inline]
 __kmem_cache_alloc_node+0x4ff/0x8b0 mm/slub.c:3490
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc_node_track_caller+0x118/0x3c0 mm/slab_common.c:986
 kvasprintf+0xbc/0x1e0 lib/kasprintf.c:25
 kvasprintf_const+0xe1/0x2b0 lib/kasprintf.c:49
 kobject_set_name_vargs+0x8e/0x2c0 lib/kobject.c:267
 dev_set_name+0x1a3/0x1d0 drivers/base/core.c:3429
 usb_alloc_dev+0x70f/0x12e0 drivers/usb/core/usb.c:726
 hub_port_connect drivers/usb/core/hub.c:5309 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5551 [inline]
 port_event drivers/usb/core/hub.c:5711 [inline]
 hub_event+0x3fd9/0x78a0 drivers/usb/core/hub.c:5793
 process_one_work+0xb0d/0x1410 kernel/workqueue.c:2408
 worker_thread+0x107e/0x1d60 kernel/workqueue.c:2555
 kthread+0x3e8/0x540 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Bytes 208-211 of 4096 are uninitialized
Memory access of size 4096 starts at ffff88811f4ed000
Data copied to user address 00007ffed594b9b7

CPU: 1 PID: 32484 Comm: udevd Not tainted 6.4.0-syzkaller-g257152fe29be #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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