Description: Fix integer overflow in graphics mode (CVE-2013-6050)
Author: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Bug-CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-6050

Index: links-2.7/html_tbl.c
===================================================================
--- links-2.7.orig/html_tbl.c   2013-11-22 01:57:29.000000000 +0100
+++ links-2.7/html_tbl.c        2013-11-22 01:58:30.000000000 +0100
@@ -1550,6 +1550,8 @@ static void add_to_rect_sets(struct rect
 static void add_to_cell_sets(struct table_cell ****s, int **nn, int *n, struct rect *r, struct table_cell *c)
 {
 	int i, j;
+	if (r->y1 < 0 || r->y2 < 0)
+		fatal_exit("add_to_cell_sets: integer overflow: %d, %d", r->y1, r->y2);
 	for (i = r->y1 >> RECT_BOUND_BITS; i <= (r->y2 - 1) >> RECT_BOUND_BITS; i++) {
 		if (i >= *n) {
 			struct table_cell ***ns;