==================================================================
BUG: KASAN: null-ptr-deref in get_fuse_conn_super fs/fuse/fuse_i.h:844 [inline]
BUG: KASAN: null-ptr-deref in fuse_test_super+0x42/0x58 fs/fuse/inode.c:1633
Read of size 8 at addr 0000000000000000 by task syz-executor.1/9107

CPU: 0 PID: 9107 Comm: syz-executor.1 Not tainted 5.15.0-rc1-syzkaller-00001-g64a19591a293 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000957e>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:112
==================================================================
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Oops [#1]
Modules linked in:
CPU: 0 PID: 9107 Comm: syz-executor.1 Tainted: G    B             5.15.0-rc1-syzkaller-00001-g64a19591a293 #0
Hardware name: riscv-virtio,qemu (DT)
epc : fuse_test_super+0x42/0x58 fs/fuse/inode.c:1633
 ra : get_fuse_conn_super fs/fuse/fuse_i.h:844 [inline]
 ra : fuse_test_super+0x42/0x58 fs/fuse/inode.c:1633
epc : ffffffff8077d842 ra : ffffffff8077d842 sp : ffffffe00fbebc80
 gp : ffffffff83f9a558 tp : ffffffe0099d5f00 t0 : ffffffff852b6bd7
 t1 : ffffffc40b5b9114 t2 : 0000000000000000 s0 : ffffffe00fbebca0
 s1 : 0000000000000000 a0 : 0000000000000001 a1 : 0000000000000003
 a2 : 1ffffffc0133abe1 a3 : ffffffff82be4052 a4 : 0000000000000000
 a5 : ffffffe0099d6f00 a6 : 0000000000f00000 a7 : ffffffe05adc88a3
 s2 : ffffffe009ddd000 s3 : ffffffe00a4bcc00 s4 : ffffffff8077d800
 s5 : 0000000000000000 s6 : ffffffff83d573c0 s7 : ffffffe00a4bcc98
 s8 : ffffffff83c42808 s9 : ffffffe00a4bccf8 s10: ffffffff8077d7e4
 s11: ffffffe023d08000 t3 : 0000000061736944 t4 : ffffffc40b5b9114
 t5 : ffffffc40b5b9115 t6 : ffffffe00fbeb8d8
status: 0000000000000120 badaddr: 0000000000000000 cause: 000000000000000d
[<ffffffff8077d842>] get_fuse_conn_super fs/fuse/fuse_i.h:844 [inline]
[<ffffffff8077d842>] fuse_test_super+0x42/0x58 fs/fuse/inode.c:1633
[<ffffffff8043a358>] sget_fc+0x14a/0x3a0 fs/super.c:525
[<ffffffff8077ea04>] fuse_get_tree+0x170/0x254 fs/fuse/inode.c:1664
[<ffffffff804381c4>] vfs_get_tree+0x4a/0x1a2 fs/super.c:1498
[<ffffffff80488732>] do_new_mount fs/namespace.c:2988 [inline]
[<ffffffff80488732>] path_mount+0xdf6/0x1420 fs/namespace.c:3318
[<ffffffff804897d6>] do_mount fs/namespace.c:3331 [inline]
[<ffffffff804897d6>] __do_sys_mount fs/namespace.c:3539 [inline]
[<ffffffff804897d6>] sys_mount+0x2a6/0x334 fs/namespace.c:3516
[<ffffffff8000519c>] ret_from_syscall+0x0/0x2
---[ end trace 1471aacedd86f2c4 ]---