Fix corruption of buffer pools by render subs

A subtitle buffer's "next" pointer was being modified after the
buffer was closed which corrupts the buffer pool.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@4380 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 4 insertions, 0 deletions

diff --git a/libhb/sync.c b/libhb/sync.c
index 6c1911b98..2c5bb9024 100644
--- a/libhb/sync.c
+++ b/libhb/sync.c
@@ -731,6 +731,10 @@ int syncVideoWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
                             if ( sync->sub_list == NULL )
                                 sync->sub_tail = NULL;
                         }
+                        else if (sync->sub_tail == sub)
+                        {
+                            sync->sub_tail = prev_sub;
+                        }
                         
                         // ...and trash it
                         hb_buffer_t *next_sub = sub->next;