From 4238f3b6e320969aaf539e6afb1cb2bfd61bb28b Mon Sep 17 00:00:00 2001
From: Richard Purdie <richard.purdie@linuxfoundation.org>
Date: Sun, 9 Aug 2015 00:03:49 -0700
Subject: runqemu: Add error handling for unexpected tap devices

In theory the code reduces the tap device number to an integer. This
patch adds error checking to ensure that does happen and that the script
exits if something unexpected happens.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
 scripts/runqemu-internal | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'scripts/runqemu-internal')

diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
index 03b40d8323..0ace485cb8 100755
--- a/scripts/runqemu-internal
+++ b/scripts/runqemu-internal
@@ -253,6 +253,14 @@ else
 
 
         n0=$(echo $TAP | sed 's/tap//')
+
+        case $n0 in
+            ''|*[!0-9]*)
+                echo "Error Couldn't turn $TAP into an interface number?"
+                exit 1
+                ;;
+        esac
+
         n1=$(($n0 * 2 + 1))
         n2=$(($n1 + 1))
 
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