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check: use ReadFull to load pack header in checkPack

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This ensures that the pack header is actually read completely.
Previously, for a truncated file it was possible to only read a part of
the header, as backend.Load(...) is not guaranteed to return as many
bytes as requested by the length parameter.
This commit is contained in:
Michael Eischer 2024-05-11 00:18:11 +02:00
parent 8f8d872a68
commit 74d90653e0
1 changed files with 3 additions and 1 deletions
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4
internal/checker/checker.go
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@ -605,11 +605,13 @@ func checkPackInner(ctx context.Context, r restic.Repository, id restic.ID, blob
if err != nil {
return &partialReadError{err}
}
curPos += minHdrStart - curPos
}
// read remainder, which should be the pack header
var err error
hdrBuf, err = io.ReadAll(bufRd)
hdrBuf = make([]byte, int(size-int64(curPos)))
_, err = io.ReadFull(bufRd, hdrBuf)
if err != nil {
return &partialReadError{err}
}