From e87de7c7e3ed042616e28a350a5e31fcf7bc09bc Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Tue, 10 Aug 2021 18:19:20 +0100
Subject: [PATCH] vfs: fix crash when truncating a just uploaded object - Fixes
 #5522

---
 vfs/file.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/vfs/file.go b/vfs/file.go
index 3a829adf6..e30d85692 100644
--- a/vfs/file.go
+++ b/vfs/file.go
@@ -744,7 +744,6 @@ func (f *File) Truncate(size int64) (err error) {
 	f.mu.Lock()
 	writers := make([]Handle, len(f.writers))
 	copy(writers, f.writers)
-	o := f.o
 	f.mu.Unlock()
 
 	// FIXME: handle closing writer
@@ -761,6 +760,12 @@ func (f *File) Truncate(size int64) (err error) {
 		return err
 	}
 
+	// if o is nil it isn't valid yet
+	o, err := f.waitForValidObject()
+	if err != nil {
+		return err
+	}
+
 	// If no writers, and size is already correct then all done
 	if o.Size() == size {
 		return nil