From 93792b5aa6806646674795504419f3e97862685c Mon Sep 17 00:00:00 2001
From: Steven Murdoch <Steven.Murdoch@cl.cam.ac.uk>
Date: Mon, 29 Aug 2011 00:36:41 +0100
Subject: Add a sanity check

---
 src/common/util.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/common/util.c b/src/common/util.c
index 371e09b8d..dd2d1110e 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -3462,10 +3462,11 @@ tor_read_all_handle(HANDLE h, char *buf, size_t count, HANDLE hProcess)
       continue;
     }
 
+    /* There is data to read; read it */
     retval = ReadFile(h, buf+numread, count-numread, &byte_count, NULL);
+    tor_assert(byte_count + numread <= count);
     if (!retval) {
-      log_warn(LD_GENERAL,
-        "Failed to read from handle: %s",
+      log_warn(LD_GENERAL, "Failed to read from handle: %s",
         format_win32_error(GetLastError()));
       return -1;
     } else if (0 == byte_count) {
-- 
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