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Re: [Qemu-devel] [PATCH 1/3] net/colo: fix memory double free error

From: Zhang Chen
Subject: Re: [Qemu-devel] [PATCH 1/3] net/colo: fix memory double free error
Date: Tue, 21 Feb 2017 10:25:13 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

On 02/20/2017 04:01 PM, zhanghailiang wrote:
The 'primary_list' and 'secondary_list' members of struct Connection
is not allocated through dynamically g_queue_new(), but we free it by using
g_queue_free(), which will lead to a double-free bug.

Signed-off-by: zhanghailiang <address@hidden>
  net/colo.c | 2 --
  1 file changed, 2 deletions(-)

diff --git a/net/colo.c b/net/colo.c
index 6a6eacd..7d5c423 100644
--- a/net/colo.c
+++ b/net/colo.c
@@ -147,9 +147,7 @@ void connection_destroy(void *opaque)
      Connection *conn = opaque;
g_queue_foreach(&conn->primary_list, packet_destroy, NULL);
-    g_queue_free(&conn->primary_list);
      g_queue_foreach(&conn->secondary_list, packet_destroy, NULL);
-    g_queue_free(&conn->secondary_list);

I think we need use g_queue_clear () here.

g_queue_clear (GQueue *queue);
Removes all the elements in queue . If queue elements contain dynamically-allocated memory, they should be freed first.

Zhang Chen

      g_slice_free(Connection, conn);

Zhang Chen

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