dicom: enforce reasonable resolution limits to guard against corrupt file (AcademySoftwareFoundation#5167)

Signed-off-by: Larry Gritz <lg@larrygritz.com>

Author: lgritz

src/dicom.imageio/dicominput.cpp

@@ -231,6 +231,8 @@ DICOMInput::seek_subimage(int subimage, int miplevel)
 
     m_spec = ImageSpec(m_img->getWidth(), m_img->getHeight(), nchannels,
                        format);
+    if (!check_open(m_spec, { 0, 1 << 20, 0, 1 << 20, 0, 1 << 16, 0, 1 << 16 }))
+        return false;
 
     m_bitspersample = m_img->getDepth();
     if (size_t(m_bitspersample) != m_spec.format.size() * 8)