[Qemu-devel] [PATCH v4 02/28] io: avoid double-free when closing QIOChannelBuffer

["Daniel P. Berrange" <berrange@redhat.com>]

The QIOChannelBuffer's close implementation will free
the internal data buffer. It failed to reset the pointer
to NULL though, so when the object is later finalized
it will free it a second time with predictable crash.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 io/channel-buffer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/io/channel-buffer.c b/io/channel-buffer.c
index 3e5117b..43d7959 100644
--- a/io/channel-buffer.c
+++ b/io/channel-buffer.c
@@ -140,6 +140,7 @@ static int qio_channel_buffer_close(QIOChannel *ioc,
     QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc);
 
     g_free(bioc->data);
+    bioc->data = NULL;
     bioc->capacity = bioc->usage = bioc->offset = 0;
 
     return 0;
-- 
2.5.0