File djvulibre-CVE-2019-18804.patch of Package djvulibre.12953
--- a/libdjvu/IW44EncodeCodec.cpp
+++ a/libdjvu/IW44EncodeCodec.cpp
@@ -405,7 +405,7 @@ filter_fv(short *p, int w, int h, int rowsize, int scale)
int y = 0;
int s = scale*rowsize;
int s3 = s+s+s;
- h = ((h-1)/scale)+1;
+ h = (h>0) ? ((h-1)/scale)+1 : 0;
y += 1;
p += s;
while (y-3 < h)
--- a/tools/ddjvu.cpp
+++ a/tools/ddjvu.cpp
@@ -279,7 +279,7 @@ render(ddjvu_page_t *page, int pageno)
prect.h = (ih * 100) / dpi;
}
/* Process aspect ratio */
- if (flag_aspect <= 0)
+ if (flag_aspect <= 0 && iw>0 && ih>0)
{
double dw = (double)iw / prect.w;
double dh = (double)ih / prect.h;