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jbig2dec: Avoid extending page image beyond INT_MAX pixels high.

Detected by Coverity in CID 95080.

--- a/jbig2_page.c

+++ b/jbig2_page.c

@@ -34,6 +34,10 @@

 #include "jbig2_page.h"

 #include "jbig2_segment.h"

+#if !defined (UINT32_MAX)

+#define UINT32_MAX 0xffffffff

+#endif

+

 /* dump the page struct info */

 static void

 dump_page_info(Jbig2Ctx *ctx, Jbig2Segment *segment, Jbig2Page *page)

@@ -268,7 +272,12 @@

     /* grow the page to accommodate a new stripe if necessary */

     if (page->striped && page->height == 0xFFFFFFFF) {

-        uint32_t new_height = y + image->height;

+        uint32_t new_height;

+

+        if (y > UINT32_MAX - image->height)

+                return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, -1, "adding image at coordinate would grow page out of bounds");

+        new_height = y + image->height;

+

         if (page->image->height < new_height) {

             Jbig2Image *resized_image = NULL;