From 8020a9e44fffb687d4372c59239958776302a8ae 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.

(From OE-Core rev: 4238f3b6e320969aaf539e6afb1cb2bfd61bb28b)

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

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))
 
-- 
cgit v1.2.3-54-g00ecf