From 0ef7bfd59c0a97b39b2e1152da30db4e96e3a915 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Wed, 16 Jan 2019 13:05:34 -0800
Subject: [PATCH] Utils: correctly handle read() errors in ReadRandomBytes()

read() returns -1 on error, so we need to use a signed type.

Test: Booted device with FDE
Change-Id: Ib44247c1cdfd38674a7439209e333823f2fb6cf8
---
 Utils.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Utils.cpp b/Utils.cpp
index 4464afc..f00d168 100644
--- a/Utils.cpp
+++ b/Utils.cpp
@@ -377,7 +377,7 @@ status_t ReadRandomBytes(size_t bytes, char* buf) {
         return -errno;
     }
 
-    size_t n;
+    ssize_t n;
     while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], bytes))) > 0) {
         bytes -= n;
         buf += n;