[<ffffffff8000a908>] syscall_handler+0x76/0xba arch/riscv/include/asm/syscall.h:90
[<ffffffff836b6b0c>] do_trap_ecall_u+0x9c/0x9e arch/riscv/kernel/traps.c:320
[<ffffffff80005c30>] ret_from_exception+0x0/0x64 arch/riscv/kernel/entry.S:102
==================================================================
BUG: KASAN: null-ptr-deref in strchr+0x18/0x58 lib/string.c:329
Read of size 1 at addr 0000000000000000 by task syz-executor.1/621

CPU: 0 PID: 621 Comm: syz-executor.1 Not tainted 6.6.0-rc1-syzkaller-00011-g3fec323339a4 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000b904>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:121
[<ffffffff836750b8>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:127
[<ffffffff836b56c0>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff836b56c0>] dump_stack_lvl+0xe8/0x154 lib/dump_stack.c:106
[<ffffffff8367dad6>] print_report+0x4da/0x4f4 mm/kasan/report.c:478
[<ffffffff805791de>] kasan_report+0xf0/0x1ba mm/kasan/report.c:588
[<ffffffff8057a146>] check_region_inline mm/kasan/generic.c:181 [inline]
[<ffffffff8057a146>] __asan_load1+0x68/0x80 mm/kasan/generic.c:257
[<ffffffff8365b58a>] strchr+0x18/0x58 lib/string.c:329
[<ffffffff80c25ca2>] kvasprintf_const+0x2c/0xc6 lib/kasprintf.c:45
[<ffffffff8362c296>] kobject_set_name_vargs+0x50/0xf2 lib/kobject.c:272
[<ffffffff8362c5ea>] kobject_add_varg lib/kobject.c:366 [inline]
[<ffffffff8362c5ea>] kobject_add+0xda/0x1a0 lib/kobject.c:424
[<ffffffff8170ba32>] device_add+0x216/0x10fa drivers/base/core.c:3560
[<ffffffff83555936>] nfc_register_device+0x5a/0x2b4 net/nfc/core.c:1118
[<ffffffff8357032e>] nci_register_device+0x534/0x612 net/nfc/nci/core.c:1257
[<ffffffff817d5fd2>] virtual_ncidev_open+0xf8/0x172 drivers/nfc/virtual_ncidev.c:148
[<ffffffff8109f6e8>] misc_open+0x2b2/0x2e8 drivers/char/misc.c:165
[<ffffffff805ec060>] chrdev_open+0x1cc/0x474 fs/char_dev.c:414
[<ffffffff805d58c6>] do_dentry_open+0x4d0/0xa84 fs/open.c:929
[<ffffffff805d95fc>] vfs_open+0x52/0x5e fs/open.c:1063
[<ffffffff8060a34c>] do_open fs/namei.c:3639 [inline]
[<ffffffff8060a34c>] path_openat+0x1014/0x1714 fs/namei.c:3796
[<ffffffff8060b9cc>] do_filp_open+0x126/0x252 fs/namei.c:3823
[<ffffffff805d9d46>] do_sys_openat2+0x170/0x1bc fs/open.c:1422
[<ffffffff805da666>] do_sys_open fs/open.c:1437 [inline]
[<ffffffff805da666>] __do_sys_openat fs/open.c:1453 [inline]
[<ffffffff805da666>] __se_sys_openat fs/open.c:1448 [inline]
[<ffffffff805da666>] __riscv_sys_openat+0x136/0x1a4 fs/open.c:1448
[<ffffffff8000a908>] syscall_handler+0x76/0xba arch/riscv/include/asm/syscall.h:90
[<ffffffff836b6b0c>] do_trap_ecall_u+0x9c/0x9e arch/riscv/kernel/traps.c:320
[<ffffffff80005c30>] ret_from_exception+0x0/0x64 arch/riscv/kernel/entry.S:102
==================================================================