From 41c8c7025bf4a3b6a51817ba612e489828fca7fe Mon Sep 17 00:00:00 2001
From: Giovanni Simoni <giovanni.simoni@yubico.com>
Date: Tue, 28 Jan 2025 14:07:36 +0100
Subject: [PATCH] util: fix sign-conversion warning

---
 util.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/util.c b/util.c
index 97880e3..f4a7791 100644
--- a/util.c
+++ b/util.c
@@ -730,7 +730,12 @@ int get_devices_from_authfile(const cfg_t *cfg, const char *username,
 #endif
   }
 
-  opwfile_size = st.st_size;
+  if (st.st_size < 0) {
+    debug_dbg(cfg, "Invalid stat size for %s: %jd", cfg->auth_file,
+              (intmax_t) st.st_size);
+    goto err;
+  }
+  opwfile_size = (size_t) st.st_size;
 
   gpu_ret = getpwuid_r(st.st_uid, &pw_s, buffer, sizeof(buffer), &pw);
   if (gpu_ret != 0 || pw == NULL) {