From 9628b3118628343f6e156d49b9f2de040f6d675b Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sat, 18 Apr 2026 07:21:38 +0900
Subject: [PATCH] iovec-util: add overflow check in iovec_total_size()

Mostly theoretical. But for safety.
---
 src/basic/iovec-util.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/basic/iovec-util.c b/src/basic/iovec-util.c
index ec8af57e64..cd2c1a736e 100644
--- a/src/basic/iovec-util.c
+++ b/src/basic/iovec-util.c
@@ -21,8 +21,11 @@ size_t iovec_total_size(const struct iovec *iovec, size_t n) {
 
         assert(iovec || n == 0);
 
-        FOREACH_ARRAY(j, iovec, n)
+        FOREACH_ARRAY(j, iovec, n) {
+                if (j->iov_len > SIZE_MAX - sum)
+                        return SIZE_MAX; /* Indicate overflow. */
                 sum += j->iov_len;
+        }
 
         return sum;
 }