1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 #include "media/ShmemUtil.h"
17 
18 namespace android {
19 namespace media {
20 
validateSharedFileRegion(const SharedFileRegion & shmem)21 bool validateSharedFileRegion(const SharedFileRegion& shmem) {
22     // FD must be valid.
23     if (shmem.fd.get() < 0) {
24         return false;
25     }
26 
27     // Size and offset must be non-negative.
28     if (shmem.size < 0 || shmem.offset < 0) {
29         return false;
30     }
31 
32     uint64_t size = shmem.size;
33     uint64_t offset = shmem.offset;
34 
35     // Must not wrap.
36     if (offset > offset + size) {
37         return false;
38     }
39 
40     return true;
41 }
42 
43 }  // namespace media
44 }  // namespace android
45