From fb77acff9ba6bb01d53940da34fb10f20b156a23 Mon Sep 17 00:00:00 2001
From: Pascal Terjan <pterjan@mageia.org>
Date: Sun, 12 Apr 2026 19:06:08 +0000
Subject: [PATCH] Prevent undefined behaviour in overflow check

Fixes #86
---
 caca/canvas.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/caca/canvas.c b/caca/canvas.c
index 7beff5b..62b72b7 100644
--- a/caca/canvas.c
+++ b/caca/canvas.c
@@ -26,6 +26,7 @@
 #   if defined(HAVE_UNISTD_H)
 #       include <unistd.h>
 #   endif
+#   include <limits.h>
 #endif
 
 #include "caca.h"
@@ -368,12 +369,12 @@ int caca_resize(caca_canvas_t *cv, int width, int height)
     int x, y, f, old_width, old_height, old_size;
 
     /* Check for overflow */
-    int new_size = width * height;
-    if (new_size < 0 || (width > 0 && new_size / width != height))
+    if (width != 0 && height > INT_MAX / width)
     {
         seterrno(EOVERFLOW);
         return -1;
     }
+    int new_size = width * height;
 
     old_width = cv->width;
     old_height = cv->height;