From: Richard Purdie <richard.purdie@linuxfoundation.org>
Date: Sun, 9 Aug 2015 07:03:49 +0000 (-0700)
Subject: runqemu: Add error handling for unexpected tap devices
X-Git-Tag: lucaceresoli/bug-15201-perf-libtraceevent-missing~29476
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4238f3b6e320969aaf539e6afb1cb2bfd61bb28b;p=thirdparty%2Fopenembedded%2Fopenembedded-core-contrib.git

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>
---

diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
index 03b40d83233..0ace485cb88 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))