X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/45ef7ce3a7bb275f8550a07cc752fa272fe07eac..4a0b6d6164ce80aa9c7b160080e2995eec2fa2ce:/windows/winpgntc.c

diff --git a/windows/winpgntc.c b/windows/winpgntc.c
index 2259e6a1..033fd5fb 100644
--- a/windows/winpgntc.c
+++ b/windows/winpgntc.c
@@ -85,7 +85,7 @@ int agent_query(void *in, int inlen, void **out, int *outlen,
     mapname = dupprintf("PageantRequest%08x", (unsigned)GetCurrentThreadId());
     filemap = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
 				0, AGENT_MAX_MSGLEN, mapname);
-    if (!filemap)
+    if (filemap == NULL || filemap == INVALID_HANDLE_VALUE)
 	return 1;		       /* *out == NULL, so failure */
     p = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0, 0);
     memcpy(p, in, inlen);