From cb6b0d2c0e8835d360f85384d3eef53fcc17dc5a Mon Sep 17 00:00:00 2001
From: William Wilgus <wilgus.william@gmail.com>
Date: Tue, 3 Aug 2021 22:22:02 -0400
Subject: disk.c ensure a valid volume is returned from get_free_volume()

volume is used for element math and indexing into buffers
-1  volume is bad

Change-Id: I1ec75ef3a848c154ea80905224ea9a3a14bf8151
---
 firmware/common/disk.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'firmware/common')

diff --git a/firmware/common/disk.c b/firmware/common/disk.c
index 51d033b678..c096878e86 100644
--- a/firmware/common/disk.c
+++ b/firmware/common/disk.c
@@ -174,6 +174,13 @@ int disk_mount(int drive)
 
     int volume = get_free_volume();
 
+    if (volume < 0)
+    {
+        DEBUGF("No Free Volumes\n");
+        disk_writer_unlock();
+        return 0;
+    }
+
     if (!disk_init(IF_MD(drive)))
     {
         disk_writer_unlock();
-- 
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