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Add more size checks when writing individual sections in the index. (#9710)

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* Add more size checks when writing individual sections in the index.

Signed-off-by: Peter Štibraný <pstibrany@gmail.com>

* Use uint and add comment about it.

Signed-off-by: Peter Štibraný <pstibrany@gmail.com>
This commit is contained in:
Peter Štibraný 2021-11-11 11:14:28 +01:00 committed by GitHub
parent 79a753db7e
commit 422e7839d4
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 22 additions and 5 deletions
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27
tsdb/index/index.go
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@ -525,7 +525,7 @@ func (w *Writer) AddSymbol(sym string) error {
func (w *Writer) finishSymbols() error {
symbolTableSize := w.f.pos - w.toc.Symbols - 4
// The symbol table's <len> part is 4 bytes. So the total symbol table size must be less than or equal to 2^32-1
if symbolTableSize > 4294967295 {
if symbolTableSize > math.MaxUint32 {
return errors.Errorf("symbol table size exceeds 4 bytes: %d", symbolTableSize)
}
@ -657,7 +657,11 @@ func (w *Writer) writeLabelIndex(name string, values []uint32) error {
// Write out the length.
w.buf1.Reset()
w.buf1.PutBE32int(int(w.f.pos - startPos - 4))
l := w.f.pos - startPos - 4
if l > math.MaxUint32 {
return errors.Errorf("label index size exceeds 4 bytes: %d", l)
}
w.buf1.PutBE32int(int(l))
if err := w.writeAt(w.buf1.Get(), startPos); err != nil {
return err
}
@ -697,7 +701,11 @@ func (w *Writer) writeLabelIndexesOffsetTable() error {
}
// Write out the length.
w.buf1.Reset()
w.buf1.PutBE32int(int(w.f.pos - startPos - 4))
l := w.f.pos - startPos - 4
if l > math.MaxUint32 {
return errors.Errorf("label indexes offset table size exceeds 4 bytes: %d", l)
}
w.buf1.PutBE32int(int(l))
if err := w.writeAt(w.buf1.Get(), startPos); err != nil {
return err
}
@ -774,7 +782,11 @@ func (w *Writer) writePostingsOffsetTable() error {
// Write out the length.
w.buf1.Reset()
w.buf1.PutBE32int(int(w.f.pos - startPos - 4))
l := w.f.pos - startPos - 4
if l > math.MaxUint32 {
return errors.Errorf("postings offset table size exceeds 4 bytes: %d", l)
}
w.buf1.PutBE32int(int(l))
if err := w.writeAt(w.buf1.Get(), startPos); err != nil {
return err
}
@ -954,7 +966,12 @@ func (w *Writer) writePosting(name, value string, offs []uint32) error {
}
w.buf2.Reset()
w.buf2.PutBE32int(w.buf1.Len())
l := w.buf1.Len()
// We convert to uint to make code compile on 32-bit systems, as math.MaxUint32 doesn't fit into int there.
if uint(l) > math.MaxUint32 {
return errors.Errorf("posting size exceeds 4 bytes: %d", l)
}
w.buf2.PutBE32int(l)
w.buf1.PutHash(w.crc32)
return w.fP.Write(w.buf2.Get(), w.buf1.Get())
}