diff -Nur openjpeg-2.3.1_old/src/bin/jpwl/convert.c openjpeg-2.3.1/src/bin/jpwl/convert.c
--- openjpeg-2.3.1_old/src/bin/jpwl/convert.c	2019-10-15 16:06:40.623000000 +0800
+++ openjpeg-2.3.1/src/bin/jpwl/convert.c	2019-10-15 16:08:59.642000000 +0800
@@ -1730,8 +1730,10 @@
 
         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;
 
@@ -1744,6 +1746,7 @@
         if (format == 2 || format == 3 || format == 5 || format == 6) {
             /* P2, P3, P5, P6: */
             s = skip_int(s, &ph->maxval);
+            if(s == NULL || *s == 0) return;
 
             if (ph->maxval > 65535) {
                 return;