From 67e3bbc7f6f7c027e23921f577040c1bcb478802 Mon Sep 17 00:00:00 2001
From: Yi-Yo Chiang <yochiang@google.com>
Date: Fri, 12 Feb 2021 15:55:50 +0800
Subject: [PATCH] Explicitly cast to 64bit integer when calculating filesystem
 size

Else the result may overflow on platforms that have 32bit long.

Bug: 165925766
Test: Presubmit
Change-Id: I3018f0bd9846651848bd9b3645f2eeaa5b61c646
---
 fs_mgr/fs_mgr_overlayfs.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index cdbadc9cd..1134f149b 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -194,7 +194,7 @@ bool fs_mgr_filesystem_has_space(const std::string& mount_point) {
     static constexpr unsigned long kSizeThreshold = 8 * 1024 * 1024;  // 8MB
 
     return (vst.f_bfree >= (vst.f_blocks * kPercentThreshold / 100)) &&
-           (vst.f_bfree * vst.f_bsize) >= kSizeThreshold;
+           (static_cast<uint64_t>(vst.f_bfree) * vst.f_frsize) >= kSizeThreshold;
 }
 
 const auto kPhysicalDevice = "/dev/block/by-name/"s;