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compress: fix crash due to nil metadata #6434

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Before this fix, if an error ocurred reading the metadata, it could be
set as nil and then used, causing a crash.

This fix changes the readMetadata function so it returns an error, and
the error is always set if the metadata returned is nil.
This commit is contained in:
Nick Craig-Wood 2022-09-14 09:02:58 +01:00
parent bc09105d2e
commit fb6ddd680c
1 changed files with 9 additions and 14 deletions
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23
backend/compress/compress.go
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@ -367,9 +367,9 @@ func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
if err != nil {
return nil, err
}
meta := readMetadata(ctx, mo)
if meta == nil {
return nil, errors.New("error decoding metadata")
meta, err := readMetadata(ctx, mo)
if err != nil {
return nil, fmt.Errorf("error decoding metadata: %w", err)
}
// Create our Object
o, err := f.Fs.NewObject(ctx, makeDataName(remote, meta.CompressionMetadata.Size, meta.Mode))
@ -1040,24 +1040,19 @@ func newMetadata(size int64, mode int, cmeta sgzip.GzipMetadata, md5 string, mim
}
// This function will read the metadata from a metadata object.
func readMetadata(ctx context.Context, mo fs.Object) (meta *ObjectMetadata) {
func readMetadata(ctx context.Context, mo fs.Object) (meta *ObjectMetadata, err error) {
// Open our meradata object
rc, err := mo.Open(ctx)
if err != nil {
return nil
return nil, err
}
defer func() {
err := rc.Close()
if err != nil {
fs.Errorf(mo, "Error closing object: %v", err)
}
}()
defer fs.CheckClose(rc, &err)
jr := json.NewDecoder(rc)
meta = new(ObjectMetadata)
if err = jr.Decode(meta); err != nil {
return nil
return nil, err
}
return meta
return meta, nil
}
// Remove removes this object
@ -1167,7 +1162,7 @@ func (o *Object) loadMetadataIfNotLoaded(ctx context.Context) (err error) {
return err
}
if o.meta == nil {
o.meta = readMetadata(ctx, o.mo)
o.meta, err = readMetadata(ctx, o.mo)
}
return err
}