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Fix encoding bug in donut during encoding phase

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Stream reading needs to check for length parameter being non zero,
after Reading() a predefined set of buffer length an EOF might be returned
with length == 0.

Erasure taking this zeroed data in might wrongly encode it as part of existing
data blocks which leads to errors while decoding even when the other contents
are intact.
This commit is contained in:
Harshavardhana
2015-10-05 22:04:13 -07:00
parent f9174632bb
commit 4ed50a8004
2 changed files with 22 additions and 25 deletions
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38
pkg/donut/bucket.go
View File

@@ -444,27 +444,29 @@ func (b bucket) writeObjectData(k, m uint8, writers []io.WriteCloser, objectData
var length int
inputData := make([]byte, chunkSize)
length, e = objectData.Read(inputData)
encodedBlocks, err := encoder.Encode(inputData)
if err != nil {
return 0, 0, err.Trace()
}
if _, err := hashWriter.Write(inputData[0:length]); err != nil {
return 0, 0, probe.NewError(err)
}
for blockIndex, block := range encodedBlocks {
errCh := make(chan error, 1)
go func(writer io.Writer, reader io.Reader, errCh chan<- error) {
defer close(errCh)
_, err := io.Copy(writer, reader)
errCh <- err
}(writers[blockIndex], bytes.NewReader(block), errCh)
if err := <-errCh; err != nil {
// Returning error is fine here CleanupErrors() would cleanup writers
if length != 0 {
encodedBlocks, err := encoder.Encode(inputData[0:length])
if err != nil {
return 0, 0, err.Trace()
}
if _, err := hashWriter.Write(inputData[0:length]); err != nil {
return 0, 0, probe.NewError(err)
}
for blockIndex, block := range encodedBlocks {
errCh := make(chan error, 1)
go func(writer io.Writer, reader io.Reader, errCh chan<- error) {
defer close(errCh)
_, err := io.Copy(writer, reader)
errCh <- err
}(writers[blockIndex], bytes.NewReader(block), errCh)
if err := <-errCh; err != nil {
// Returning error is fine here CleanupErrors() would cleanup writers
return 0, 0, probe.NewError(err)
}
}
totalLength += length
chunkCount = chunkCount + 1
}
totalLength += length
chunkCount = chunkCount + 1
}
if e != io.EOF {
return 0, 0, probe.NewError(e)