From 8066f8a3470f9d2f3682a28641a7b09eca29a105 Mon Sep 17 00:00:00 2001
From: "Neal H. Walfield" <neal@g10code.com>
Date: Tue, 23 Feb 2016 21:04:29 +0100
Subject: [PATCH] common: Check for an error before reading.

* common/iobuf.c (iobuf_copy): If DEST has a pending error, don't
start copying.

--
Signed-off-by: Neal H. Walfield <neal@g10code.com>
---
 common/iobuf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/iobuf.c b/common/iobuf.c
index 6a9060a0e..1f2cd3f5d 100644
--- a/common/iobuf.c
+++ b/common/iobuf.c
@@ -2237,6 +2237,9 @@ iobuf_copy (iobuf_t dest, iobuf_t source)
   assert (source->use == IOBUF_INPUT || source->use == IOBUF_INPUT_TEMP);
   assert (dest->use == IOBUF_OUTPUT || source->use == IOBUF_OUTPUT_TEMP);
 
+  if (iobuf_error (dest))
+    return -1;
+
   temp = xmalloc (temp_size);
   while (1)
     {