diff -Nur openjpeg-1.5.1_old/applications/codec/convert.c openjpeg-1.5.1/applications/codec/convert.c
--- openjpeg-1.5.1_old/applications/codec/convert.c	2019-10-14 16:21:31.717000000 +0800
+++ openjpeg-1.5.1/applications/codec/convert.c	2019-10-14 16:22:23.444000000 +0800
@@ -1630,8 +1630,10 @@
     if( !have_wh)
   {
     s = skip_int(s, &ph->width);
+    if(s == NULL || *s == 0) return;
 
     s = skip_int(s, &ph->height);
+    if(s == NULL || *s == 0) return;
 
     have_wh = 1;
 
@@ -1643,6 +1645,7 @@
   {
 /* P2, P3, P5, P6: */
     s = skip_int(s, &ph->maxval);
+    if(s == NULL || *s == 0) return;
 
     if(ph->maxval > 65535) return;
   }