[PATCH] qga: fix a memory leak in qmp_guest_exec_status()

[Yi Wang]

From: Wang Yechao <wang.yechao...@zte.com.cn>

The $GuestExecInfo.out.data is alloced in guest_exec_output_watch(),
and the buffer size is $GuestExecInfo.out.size. We should free the
$GuestExecInfo.out.data judge by the size, not length. Because the
$GuestExecInfo.out.length maybe zero in some case.

$GuestExecInfo.err.data has the same problem.

Signed-off-by: Yechao Wang <wang.yechao...@zte.com.cn>
Signed-off-by: Yi Wang <wang.y...@zte.com.cn>
---
 qga/commands.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/qga/commands.c b/qga/commands.c
index d3fec80..58d4da9 100644
--- a/qga/commands.c
+++ b/qga/commands.c
@@ -214,17 +214,21 @@ GuestExecStatus *qmp_guest_exec_status(int64_t pid, Error 
**errp)
         if (gei->out.length > 0) {
             ges->has_out_data = true;
             ges->out_data = g_base64_encode(gei->out.data, gei->out.length);
-            g_free(gei->out.data);
             ges->has_out_truncated = gei->out.truncated;
         }
 
         if (gei->err.length > 0) {
             ges->has_err_data = true;
             ges->err_data = g_base64_encode(gei->err.data, gei->err.length);
-            g_free(gei->err.data);
             ges->has_err_truncated = gei->err.truncated;
         }
 
+        if (gei->out.size > 0)
+            g_free(gei->out.data);
+
+        if (gei->err.size > 0)
+             g_free(gei->err.data);
+
         QTAILQ_REMOVE(&guest_exec_state.processes, gei, next);
         g_free(gei);
     }
-- 
1.8.3.1