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Subject[PATCH 3/3] 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 <neilb@suse.de>
---
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 5c03f0dfb98b..facc2a840f7b 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -1221,7 +1221,7 @@ 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;
@@ -1233,7 +1233,7 @@ 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,



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