File 0001-utils-lockfile-avoid-stack-overflow-for-lockfile-buf.patch of Package rtorrent

From 954bfb70f24578ef33b1f77cf1a3d64fc2f2f595 Mon Sep 17 00:00:00 2001
From: Aleksa Sarai <cyphar@cyphar.com>
Date: Mon, 20 Jun 2022 19:09:57 +1000
Subject: [PATCH] utils: lockfile: avoid stack overflow for lockfile buffer
References: https://github.com/rakshasa/rtorrent/pull/1169

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
---
 src/utils/lockfile.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/utils/lockfile.cc b/src/utils/lockfile.cc
index 7d11d8c9970f..fac5cb23e26f 100644
--- a/src/utils/lockfile.cc
+++ b/src/utils/lockfile.cc
@@ -98,7 +98,8 @@ Lockfile::try_lock() {
   int pos = ::gethostname(buf, 255);
 
   if (pos == 0) {
-    ::snprintf(buf + std::strlen(buf), 255, ":+%i\n", ::getpid());
+    ssize_t len = std::strlen(buf);
+    ::snprintf(buf + len, 255 - len, ":+%i\n", ::getpid());
     int __UNUSED result = ::write(fd, buf, std::strlen(buf));
   }
 
-- 
2.36.1