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-rw-r--r--backend/tiff/tiff-document.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/backend/tiff/tiff-document.c b/backend/tiff/tiff-document.c
index 3d273fee..7e384212 100644
--- a/backend/tiff/tiff-document.c
+++ b/backend/tiff/tiff-document.c
@@ -268,13 +268,14 @@ tiff_document_render (EvDocument *document,
return NULL;
}
- bytes = height * rowstride;
- if (bytes / rowstride != height) {
+ if (height >= INT_MAX / rowstride) {
g_warning("Overflow while rendering document.");
/* overflow */
return NULL;
}
+ bytes = height * rowstride;
+
pixels = g_try_malloc (bytes);
if (!pixels) {
g_warning("Failed to allocate memory for rendering.");
@@ -356,15 +357,17 @@ tiff_document_render_pixbuf (EvDocument *document,
if (width <= 0 || height <= 0)
return NULL;
- rowstride = width * 4;
- if (rowstride / 4 != width)
+
+ if (width >= INT_MAX / 4)
/* overflow */
return NULL;
- bytes = height * rowstride;
- if (bytes / rowstride != height)
+ rowstride = width * 4;
+
+ if (height >= INT_MAX / rowstride)
/* overflow */
return NULL;
+ bytes = height * rowstride;
pixels = g_try_malloc (bytes);
if (!pixels)