Amir Goldstein c7242a45cb ovl: fix NULL pointer defer when encoding non-decodable lower fid
A wrong return value from ovl_check_encode_origin() would cause
ovl_dentry_to_fid() to try to encode fid from NULL upper dentry.

Reported-by: syzbot+2208f82282740c1c8915@syzkaller.appspotmail.com
Fixes: 16aac5ad1fa9 ("ovl: support encoding non-decodable file handles")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
2023-10-03 09:24:11 +03:00
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