From d15ed616e91b1d0c24aa6ee2405c9d8607cc8d1c Mon Sep 17 00:00:00 2001
From: Kwarde <kevin@kwarde.com>
Date: Tue, 22 Jul 2025 06:45:46 +0200
Subject: [PATCH] atoi: Prevent (unsigned) overflow

---
 src/convert.asm | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/convert.asm b/src/convert.asm
index 5f10c7d..1b5b7da 100644
--- a/src/convert.asm
+++ b/src/convert.asm
@@ -150,6 +150,12 @@ atoi:
 		.calcNum_cnt:
 		imul	r9
 
+		mov	rdx, -1
+		sub	rdx, r10
+		cmp	rax, rdx
+		;TODO: Add signed checks
+		ja	.overflow
+
 		add	r10, rax
 		dec	rdi
 		inc	r8
@@ -159,6 +165,10 @@ atoi:
 
 	.wrapup_neg:
 	neg	r10
+	jmp	.quit
+
+	.overflow:
+	xor	r10, r10
 
 	.quit:
 	mov	rax, r10