diff options
| author | NeilBrown <neilb@suse.de> | 2015-05-08 02:16:23 +0200 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2015-10-06 15:55:23 +0200 |
| commit | 7d35199e15b82a4d1a20049153b03e6258ce79f7 (patch) | |
| tree | 285948462f1025eba99217bbb979399f414b41d5 /fs | |
| parent | Btrfs: open_ctree: Fix possible memory leak (diff) | |
| download | linux-7d35199e15b82a4d1a20049153b03e6258ce79f7.tar.xz linux-7d35199e15b82a4d1a20049153b03e6258ce79f7.zip | |
BTRFS: 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>
Acked-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/export.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index 8d052209f473..2513a7f53334 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -112,11 +112,11 @@ static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh, u32 generation; if (fh_type == FILEID_BTRFS_WITH_PARENT) { - if (fh_len != BTRFS_FID_SIZE_CONNECTABLE) + if (fh_len < BTRFS_FID_SIZE_CONNECTABLE) return NULL; root_objectid = fid->root_objectid; } else if (fh_type == FILEID_BTRFS_WITH_PARENT_ROOT) { - if (fh_len != BTRFS_FID_SIZE_CONNECTABLE_ROOT) + if (fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT) return NULL; root_objectid = fid->parent_root_objectid; } else @@ -136,11 +136,11 @@ static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh, u32 generation; if ((fh_type != FILEID_BTRFS_WITH_PARENT || - fh_len != BTRFS_FID_SIZE_CONNECTABLE) && + fh_len < BTRFS_FID_SIZE_CONNECTABLE) && (fh_type != FILEID_BTRFS_WITH_PARENT_ROOT || - fh_len != BTRFS_FID_SIZE_CONNECTABLE_ROOT) && + fh_len < BTRFS_FID_SIZE_CONNECTABLE_ROOT) && (fh_type != FILEID_BTRFS_WITHOUT_PARENT || - fh_len != BTRFS_FID_SIZE_NON_CONNECTABLE)) + fh_len < BTRFS_FID_SIZE_NON_CONNECTABLE)) return NULL; objectid = fid->objectid; |