From 92acca45428f28c0b387f85b52b230d526dd0ecc Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 8 May 2015 10:16:23 +1000 Subject: [PATCH] UDF: support NFSv2 export The "fh_len" passed to ->fh_to_* is not guaranteed to be that same as that returned by encode_fh - it may be larger. With NFSv2, the filehandle is fixed length, so it may appear longer than expected and be zero-padded. So we must test that fh_len is at least some value, not exactly equal to it. Signed-off-by: NeilBrown Signed-off-by: Jan Kara --- fs/udf/namei.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/udf/namei.c b/fs/udf/namei.c index 6abbb649c28a..c97b5a8d1e24 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -1272,7 +1272,7 @@ static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, static struct dentry *udf_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { - if ((fh_len != 3 && fh_len != 5) || + if (fh_len < 3 || (fh_type != FILEID_UDF_WITH_PARENT && fh_type != FILEID_UDF_WITHOUT_PARENT)) return NULL; @@ -1284,7 +1284,7 @@ static struct dentry *udf_fh_to_dentry(struct super_block *sb, static struct dentry *udf_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { - if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) + if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) return NULL; return udf_nfs_get_inode(sb, fid->udf.parent_block, -- GitLab