From bbce23ade0d17c7ef4dbd6042009e0f2419f9668 Mon Sep 17 00:00:00 2001
From: Haihua Hu <jared.hu@nxp.com>
Date: Mon, 6 Nov 2017 15:05:47 +0800
Subject: [PATCH] fdmemory: need unmap if mapping flags are not subset of
 previous

Upstream-Status: Pending
https://bugzilla.gnome.org/show_bug.cgi?id=789952

---
 gst-libs/gst/allocators/gstfdmemory.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/gst-libs/gst/allocators/gstfdmemory.c b/gst-libs/gst/allocators/gstfdmemory.c
index ad428a7..1e6125a 100644
--- a/gst-libs/gst/allocators/gstfdmemory.c
+++ b/gst-libs/gst/allocators/gstfdmemory.c
@@ -97,9 +97,13 @@ gst_fd_mem_map (GstMemory * gmem, gsize maxsize, GstMapFlags flags)
     if ((mem->mmapping_flags & prot) == prot) {
       ret = mem->data;
       mem->mmap_count++;
+      goto out;
+    } else {
+      /* if mapping flags is not a subset, need unmap first */
+      munmap ((void *) mem->data, gmem->maxsize);
+      mem->data = NULL;
+      mem->mmap_count = 0;;
     }
-
-    goto out;
   }
 
   if (mem->fd != -1) {
-- 
1.9.1