glupload: fix segfault

Without this fix, it is possible that outbuf is not initialized, which
will result in segfault when call gst_buffer_replace (&outbuf, NULL). In
addition, the patch fixes potential memory leak in restart path.

The segfault can be reproduced by the pipeline below:

GST_GL_PLATFORM=egl \
gst-launch-1.0 videotestsrc ! msdkh265enc ! msdkh265dec ! \
'video/x-raw(memory:DMABuf)' ! glimagesink

diff --git a/gst-libs/gst/gl/gstglupload.c b/gst-libs/gst/gl/gstglupload.c
index 2437460..71e7068 100644 (file)
--- a/gst-libs/gst/gl/gstglupload.c
+++ b/gst-libs/gst/gl/gstglupload.c
@@ -2024,7 +2024,7 @@ gst_gl_upload_perform_with_buffer (GstGLUpload * upload, GstBuffer * buffer,
     GstBuffer ** outbuf_ptr)
 {
   GstGLUploadReturn ret = GST_GL_UPLOAD_ERROR;
-  GstBuffer *outbuf;
+  GstBuffer *outbuf = NULL;
   gpointer last_impl = upload->priv->method_impl;
 
   g_return_val_if_fail (GST_IS_GL_UPLOAD (upload), FALSE);
@@ -2065,6 +2065,8 @@ restart:
         break;
       }
     }
+
+    gst_buffer_replace (&outbuf, NULL);
     goto restart;
   } else if (ret == GST_GL_UPLOAD_DONE || ret == GST_GL_UPLOAD_RECONFIGURE) {
     if (last_impl != upload->priv->method_impl) {
@@ -2079,6 +2081,7 @@ restart:
     /* we are done */
   } else {
     upload->priv->method_impl = NULL;
+    gst_buffer_replace (&outbuf, NULL);
     NEXT_METHOD;
   }