From ba82092e43d4769dbc6f0557d58a243f93542486 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Fri, 22 May 2026 19:20:51 +0200
Subject: common: validate PLIST_DATE values before Time64_T conversion

Avoid undefined behavior when serializing malformed PLIST_DATE values
containing NaN, infinity, or values outside the Time64_T range. Add a
shared helper for checked date conversion and use it across writer paths.
---
 src/out-plutil.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/out-plutil.c')

diff --git a/src/out-plutil.c b/src/out-plutil.c
index 9f7968e..3b5bd34 100644
--- a/src/out-plutil.c
+++ b/src/out-plutil.c
@@ -237,7 +237,10 @@ static plist_err_t node_to_string(node_t node, bytearray_t **outbuf, uint32_t de
         break;
     case PLIST_DATE:
         {
-            Time64_T timev = (Time64_T)node_data->realval + MAC_EPOCH;
+            Time64_T timev;
+            if (plist_real_to_time64(node_data->realval, &timev) < 0) {
+                return PLIST_ERR_INVALID_ARG;
+            }
             struct TM _btime;
             struct TM *btime = gmtime64_r(&timev, &_btime);
             if (btime) {
-- 
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