From 2d188a9987789f019dae2d46c50578a474ab2bdd Mon Sep 17 00:00:00 2001
From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Wed, 20 Dec 2023 20:48:54 +0100
Subject: [PATCH] src/passwd.c: Add overflow check

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Link: <https://github.com/shadow-maint/shadow/pull/876>
Co-developed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

Reference: https://github.com/shadow-maint/shadow/commit/2d188a9987789f019dae2d46c50578a474ab2bdd
Conflict: NA
---
 src/passwd.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/passwd.c b/src/passwd.c
index a24e62dfd..f494a9257 100644
--- a/src/passwd.c
+++ b/src/passwd.c
@@ -387,8 +387,9 @@ static void check_password (const struct passwd *pw, const struct spwd *sp)
 		long now, ok;
 		now = time(NULL) / DAY;
 		ok = sp->sp_lstchg;
-		if (sp->sp_min > 0) {
-			ok += sp->sp_min;
+		if (   (sp->sp_min > 0)
+		    && __builtin_add_overflow(ok, sp->sp_min, &ok)) {
+			ok = LONG_MAX;
 		}
 
 		if (now < ok) {