render plain text file if the LFS object doesn't exist

routers/web/repo/view.go

@@ -234,7 +234,7 @@ func getFileReader(ctx gocontext.Context, repoID int64, blob *git.Blob) ([]byte,
 	}
 
 	meta, err := git_model.GetLFSMetaObjectByOid(ctx, repoID, pointer.Oid)
-	if err != nil && err != git_model.ErrLFSObjectNotExist { // fallback to plain file
+	if err != nil && err == git_model.ErrLFSObjectNotExist { // fallback to plain file
 		return buf, dataRc, &fileInfo{isTextFile, false, blob.Size(), nil, st}, nil
 	}
 

tests/gitea-repositories-meta/user2/lfs.git/objects/30/77e1c4c8964613df72c37d14275c1eda5228a9

@@ -0,0 +1,2 @@
+x
K��OR0�0`p��	�t
+��s��MQH��)I-��I+VH�LK3rS��S�,ݒԊ.-���t"U&e��23�,1'�8�
��A�

tests/gitea-repositories-meta/user2/lfs.git/refs/heads/master

@@ -1 +1 @@
-73cf03db6ece34e12bf91e8853dc58f678f2f82d
+e9c32647bab825977942598c0efa415de300304b

tests/integration/lfs_view_test.go

@@ -80,4 +80,17 @@ func TestLFSRender(t *testing.T) {
 		content := doc.Find("div.file-view").Text()
 		assert.Contains(t, content, "Testing READMEs in LFS")
 	})
+
+	// check that an invalid lfs entry defaults to plaintext
+	t.Run("Invalid", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", "/user2/lfs/src/branch/master/invalid")
+		resp := session.MakeRequest(t, req, http.StatusOK)
+
+		doc := NewHTMLParser(t, resp.Body).doc
+
+		content := doc.Find("div.file-view").Text()
+		assert.Contains(t, content, "oid sha256:9d178b5f15046343fd32f451df93acc2bdd9e6373be478b968e4cad6b6647351")
+	})
 }