diff --git a/core/fxcodec/jbig2/JBig2_Context.cpp b/core/fxcodec/jbig2/JBig2_Context.cpp
index c8095c8..a3c6f58 100644
--- a/core/fxcodec/jbig2/JBig2_Context.cpp
+++ b/core/fxcodec/jbig2/JBig2_Context.cpp
@@ -637,10 +637,8 @@
       m_pStream->readShortInteger(&wFlags) != 0) {
     return JBIG2_ERROR_TOO_SHORT;
   }
-  if (ri.width <= 0 || ri.width > JBIG2_MAX_IMAGE_SIZE || ri.height <= 0 ||
-      ri.height > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(ri.width, ri.height))
     return JBIG2_ERROR_FATAL;
-  }
 
   auto pTRD = pdfium::MakeUnique<CJBig2_TRDProc>();
   pTRD->SBW = ri.width;
@@ -995,15 +993,11 @@
     return JBIG2_ERROR_TOO_SHORT;
   }
 
-  if (pHRD->HGW == 0 || pHRD->HGW > JBIG2_MAX_IMAGE_SIZE || pHRD->HGH == 0 ||
-      pHRD->HGH > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(pHRD->HGW, pHRD->HGH))
     return JBIG2_ERROR_FATAL;
-  }
 
-  if (ri.width <= 0 || ri.width > JBIG2_MAX_IMAGE_SIZE || ri.height <= 0 ||
-      ri.height > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(ri.width, ri.height))
     return JBIG2_ERROR_FATAL;
-  }
 
   pHRD->HBW = ri.width;
   pHRD->HBH = ri.height;
@@ -1169,10 +1163,8 @@
       m_pStream->read1Byte(&cFlags) != 0) {
     return JBIG2_ERROR_TOO_SHORT;
   }
-  if (ri.width <= 0 || ri.width > JBIG2_MAX_IMAGE_SIZE || ri.height <= 0 ||
-      ri.height > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(ri.width, ri.height))
     return JBIG2_ERROR_FATAL;
-  }
 
   auto pGRRD = pdfium::MakeUnique<CJBig2_GRRDProc>();
   pGRRD->GRW = ri.width;
diff --git a/core/fxcodec/jbig2/JBig2_GrdProc.cpp b/core/fxcodec/jbig2/JBig2_GrdProc.cpp
index faa4865..55c6bb9 100644
--- a/core/fxcodec/jbig2/JBig2_GrdProc.cpp
+++ b/core/fxcodec/jbig2/JBig2_GrdProc.cpp
@@ -46,10 +46,8 @@
 std::unique_ptr<CJBig2_Image> CJBig2_GRDProc::decode_Arith(
     CJBig2_ArithDecoder* pArithDecoder,
     JBig2ArithCtx* gbContext) {
-  if (GBW == 0 || GBW > JBIG2_MAX_IMAGE_SIZE || GBH == 0 ||
-      GBH > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(GBW, GBH))
     return pdfium::MakeUnique<CJBig2_Image>(GBW, GBH);
-  }
 
   if (GBTEMPLATE == 0) {
     if (UseTemplate0Opt3())
@@ -642,8 +640,7 @@
     CJBig2_ArithDecoder* pArithDecoder,
     JBig2ArithCtx* gbContext,
     PauseIndicatorIface* pPause) {
-  if (GBW == 0 || GBW > JBIG2_MAX_IMAGE_SIZE || GBH == 0 ||
-      GBH > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(GBW, GBH)) {
     m_ProssiveStatus = FXCODEC_STATUS_DECODE_FINISH;
     return FXCODEC_STATUS_DECODE_FINISH;
   }
diff --git a/core/fxcodec/jbig2/JBig2_GrrdProc.cpp b/core/fxcodec/jbig2/JBig2_GrrdProc.cpp
index f5f569c..8622090 100644
--- a/core/fxcodec/jbig2/JBig2_GrrdProc.cpp
+++ b/core/fxcodec/jbig2/JBig2_GrrdProc.cpp
@@ -16,10 +16,8 @@
 std::unique_ptr<CJBig2_Image> CJBig2_GRRDProc::decode(
     CJBig2_ArithDecoder* pArithDecoder,
     JBig2ArithCtx* grContext) {
-  if (GRW == 0 || GRW > JBIG2_MAX_IMAGE_SIZE || GRH == 0 ||
-      GRH > JBIG2_MAX_IMAGE_SIZE) {
+  if (!CJBig2_Image::IsValidImageSize(GRW, GRH))
     return pdfium::MakeUnique<CJBig2_Image>(GRW, GRH);
-  }
 
   if (!GRTEMPLATE) {
     if ((GRAT[0] == -1) && (GRAT[1] == -1) && (GRAT[2] == -1) &&
diff --git a/core/fxcodec/jbig2/JBig2_Image.cpp b/core/fxcodec/jbig2/JBig2_Image.cpp
index d229e0c..7a01d01 100644
--- a/core/fxcodec/jbig2/JBig2_Image.cpp
+++ b/core/fxcodec/jbig2/JBig2_Image.cpp
@@ -68,6 +68,12 @@
 
 CJBig2_Image::~CJBig2_Image() {}
 
+// static
+bool CJBig2_Image::IsValidImageSize(int32_t w, int32_t h) {
+  return w > 0 && w <= JBIG2_MAX_IMAGE_SIZE && h > 0 &&
+         h <= JBIG2_MAX_IMAGE_SIZE;
+}
+
 int CJBig2_Image::getPixel(int32_t x, int32_t y) const {
   if (!m_pData)
     return 0;
diff --git a/core/fxcodec/jbig2/JBig2_Image.h b/core/fxcodec/jbig2/JBig2_Image.h
index c098040..51ccaeb 100644
--- a/core/fxcodec/jbig2/JBig2_Image.h
+++ b/core/fxcodec/jbig2/JBig2_Image.h
@@ -29,6 +29,8 @@
   CJBig2_Image(const CJBig2_Image& im);
   ~CJBig2_Image();
 
+  static bool IsValidImageSize(int32_t w, int32_t h);
+
   int32_t width() const { return m_nWidth; }
   int32_t height() const { return m_nHeight; }
   int32_t stride() const { return m_nStride; }