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[Openvpn-devel,v5] win32-util: Handle return value from WideCharToMultiByte better

Message ID 20260304164928.15819-1-gert@greenie.muc.de
State New
Headers show
Series [Openvpn-devel,v5] win32-util: Handle return value from WideCharToMultiByte better | expand

Commit Message

Gert Doering March 4, 2026, 4:49 p.m. UTC 
From: Frank Lichtenheld <frank@lichtenheld.com>

Handle the case where the return value is zero
and avoid sign-compare warning.

Change-Id: I4ff7983a33426fda9a138fe6e56a1c03522836d3
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1495
---

This change was reviewed on Gerrit and approved by at least one
developer. I request to merge it to master.

Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1495
This mail reflects revision 5 of this Change.

Acked-by according to Gerrit (reflected above):
Arne Schwabe <arne-openvpn@rfc2549.org>
diff mbox series

Patch

diff --git a/src/openvpn/win32-util.c b/src/openvpn/win32-util.c
index e60cbac..6fc3be4 100644
--- a/src/openvpn/win32-util.c
+++ b/src/openvpn/win32-util.c
@@ -146,11 +146,6 @@ 
     return true;
 }
 
-#if defined(__GNUC__) || defined(__clang__)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wsign-compare"
-#endif
-
 const char *
 win_get_tempdir(void)
 {
@@ -162,7 +157,14 @@ 
         return NULL;
     }
 
-    if (WideCharToMultiByte(CP_UTF8, 0, wtmpdir, -1, NULL, 0, NULL, NULL) > sizeof(tmpdir))
+    int ret = WideCharToMultiByte(CP_UTF8, 0, wtmpdir, -1, NULL, 0, NULL, NULL);
+    /* According to documentation ret is never < 0, but include it here just in case */
+    if (ret <= 0)
+    {
+        msg(M_WARN | M_ERRNO, "Conversion of path name failed.");
+        return NULL;
+    }
+    if ((unsigned int)ret > sizeof(tmpdir))
     {
         msg(M_WARN, "Could not get temporary directory. Path is too long."
                     "  Consider using --tmp-dir");
@@ -173,7 +175,4 @@ 
     return tmpdir;
 }
 
-#if defined(__GNUC__) || defined(__clang__)
-#pragma GCC diagnostic pop
-#endif
 #endif /* _WIN32 */