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Code Issues Releases Wiki Activity

repository.LoadBlob: Read correct number of bytes

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This commit is contained in:
Alexander Neumann 2017-01-24 11:27:36 +01:00
parent 3d2fbed55f
commit 2de7e03698
1 changed files with 9 additions and 5 deletions
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14
src/restic/repository/repository.go
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@ -77,7 +77,7 @@ func (r *Repository) LoadAndDecrypt(t restic.FileType, id restic.ID) ([]byte, er
// pack from the backend, the result is stored in plaintextBuf, which must be
// large enough to hold the complete blob.
func (r *Repository) loadBlob(id restic.ID, t restic.BlobType, plaintextBuf []byte) (int, error) {
debug.Log("load %v with id %v (buf %p, len %d)", t, id.Str(), plaintextBuf, len(plaintextBuf))
debug.Log("load %v with id %v (buf len %v, cap %d)", t, id.Str(), len(plaintextBuf), cap(plaintextBuf))
// lookup packs
blobs, err := r.idx.Lookup(id, t)
@ -96,7 +96,12 @@ func (r *Repository) loadBlob(id restic.ID, t restic.BlobType, plaintextBuf []by
// load blob from pack
h := restic.Handle{Type: restic.DataFile, Name: blob.PackID.String()}
plaintextBuf = plaintextBuf[:cap(plaintextBuf)]
if uint(cap(plaintextBuf)) < blob.Length {
return 0, errors.Errorf("buffer is too small: %v < %v", cap(plaintextBuf), blob.Length)
}
plaintextBuf = plaintextBuf[:blob.Length]
n, err := restic.ReadAt(r.be, h, int64(blob.Offset), plaintextBuf)
if err != nil {
@ -526,9 +531,8 @@ func (r *Repository) LoadBlob(t restic.BlobType, id restic.ID, buf []byte) (int,
return 0, err
}
buf = buf[:cap(buf)]
if len(buf) < restic.CiphertextLength(int(size)) {
return 0, errors.Errorf("buffer is too small for data blob (%d < %d)", len(buf), restic.CiphertextLength(int(size)))
if cap(buf) < restic.CiphertextLength(int(size)) {
return 0, errors.Errorf("buffer is too small for data blob (%d < %d)", cap(buf), restic.CiphertextLength(int(size)))
}
n, err := r.loadBlob(id, t, buf)