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vp8l: fix integer overflow in pEnd calculation #24

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vp8l: fix integer overflow in pEnd calculation #24

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7 changes: 6 additions & 1 deletion vp8l/decode.go
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Original file line number Diff line number Diff line change
Expand Up @@ -438,7 +438,12 @@ func (d *decoder) decodePix(w int32, h int32, minCap int32, topLevel bool) ([]by
return nil, err
}
dist := distanceMap(w, distCode)
pEnd := p + 4*int(length)
// Ensure length is not so large that 4*length overflows an int.
if int64(length) > math.MaxInt32 {
return errInvalidString
}
pEnd := p + 4*int(length)

q := p - 4*int(dist)
qEnd := pEnd - 4*int(dist)
if p < 0 || len(pix) < pEnd || q < 0 || len(pix) < qEnd {
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