From f011d8ca9ca25232fb335eead1c8eeaf5c7f2c54 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Verschelde?= <rverschelde@gmail.com>
Date: Sat, 11 Feb 2023 20:44:45 +0100
Subject: [PATCH] Math: Prevent division by zero in posmod

Fixes #43932.

Co-authored-by: David Hoppenbrouwers <david@salt-inc.org>
---
 core/math/math_funcs.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/math/math_funcs.h b/core/math/math_funcs.h
index 0fa82bb8c1c..078320d6203 100644
--- a/core/math/math_funcs.h
+++ b/core/math/math_funcs.h
@@ -31,6 +31,7 @@
 #ifndef MATH_FUNCS_H
 #define MATH_FUNCS_H
 
+#include "core/error/error_macros.h"
 #include "core/math/math_defs.h"
 #include "core/math/random_pcg.h"
 #include "core/typedefs.h"
@@ -225,6 +226,7 @@ public:
 	}
 
 	static _ALWAYS_INLINE_ int64_t posmod(int64_t p_x, int64_t p_y) {
+		ERR_FAIL_COND_V_MSG(p_y == 0, 0, "Division by zero in posmod is undefined. Returning 0 as fallback.");
 		int64_t value = p_x % p_y;
 		if (((value < 0) && (p_y > 0)) || ((value > 0) && (p_y < 0))) {
 			value += p_y;