null-ptr-deref in exfat_cache_inval_inode

I report a null pointer dereference bug (in linux-5.9.0-rc6) found by kernel fuzz. kernel config: https://github.com/butterflyhack/syzkaller-fuzz/blob/master/v5.9.0-rc6-config and can reproduce. the crash log is asblow: RBP: 2000 R08: 7f5988f22b00 R09: 2000 R10:

null-ptr-deref in exfat_cache_inval_inode

I report a null pointer deref bug (in linux-5.9.0-rc6) found by kernel fuzz. kernel config: https://github.com/butterflyhack/syzkaller-fuzz/blob/master/v5.9.0-rc6-config and can reproduce. the crash log is asblow: RBP: 2000 R08: 7f5988f22b00 R09: 2000 R10: