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ovl: fix NULL pointer defer when encoding non-decodable lower fid

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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: 16aac5ad1f ("ovl: support encoding non-decodable file handles")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Amir Goldstein 2023-10-03 09:21:27 +03:00
parent a535116d80
commit c7242a45cb
1 changed files with 1 additions and 1 deletions
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fs/overlayfs/export.c
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@ -188,7 +188,7 @@ static int ovl_check_encode_origin(struct dentry *dentry)
/* Lower file handle for non-upper non-decodable */
if (!ovl_dentry_upper(dentry) && !decodable)
return 0;
return 1;
/* Upper file handle for pure upper */
if (!ovl_dentry_lower(dentry))