PVS-Studio warning V557 for Skia

static void p3d_interp(const SkScalar src[3],
                       SkScalar dst[3], SkScalar t) {
    SkScalar ab = SkScalarInterp(src[0], src[3], t);
    SkScalar bc = SkScalarInterp(src[3], src[6], t);
    dst[0] = ab;
    dst[3] = SkScalarInterp(ab, bc, t);
    dst[6] = bc;
}

void SkConic::chopAt(SkScalar t, SkConic dst[2]) const {
  SkP3D tmp[3], tmp2[3];

  ratquad_mapTo3D(fPts, fW, tmp);

  p3d_interp(&tmp[0].fX, &tmp2[0].fX, t);
  p3d_interp(&tmp[0].fY, &tmp2[0].fY, t);
  p3d_interp(&tmp[0].fZ, &tmp2[0].fZ, t);
  ....
}

This suspicious code was found in Skia project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The '3' index is pointing beyond array bound. skgeometry.cpp 1480

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/