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BUG: KASAN: null-ptr-deref in fuse_copy_do+0x286/0x320 fs/fuse/dev.c:807
Read of size 6 at addr 0000000000000000 by task syz.0.1622/11313

CPU: 3 UID: 0 PID: 11313 Comm: syz.0.1622 Not tainted 6.13.0-rc1-syzkaller-00182-gb8f52214c61a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 kasan_report+0xd9/0x110 mm/kasan/report.c:602
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
 fuse_copy_do+0x286/0x320 fs/fuse/dev.c:807
 fuse_copy_one fs/fuse/dev.c:1065 [inline]
 fuse_copy_args+0x1e6/0x770 fs/fuse/dev.c:1083
 fuse_dev_do_read+0x1608/0x2320 fs/fuse/dev.c:1357
 fuse_dev_read+0x156/0x1f0 fs/fuse/dev.c:1424
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x87f/0xbe0 fs/read_write.c:565
 ksys_read+0x12b/0x250 fs/read_write.c:708
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd58557e8ec
Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 93 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 ef 93 02 00 48
RSP: 002b:00007fd586406fd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000002000a3c0 RCX: 00007fd58557e8ec
RDX: 0000000000002000 RSI: 000000002000a3c0 RDI: 0000000000000004
RBP: 00007fd5855f3cc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000020001140 R14: 00007fd585746080 R15: 00007ffeff642388
 </TASK>
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