base-files: ipcalc.sh handle start and range being empty strings

If we're being paranoid and quote all the arguments to ipcalc.sh,
it's possible to pass in empty start and range arguments.  This
should be handled the same as their being absent.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
Link: https://github.com/openwrt/openwrt/pull/15946
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh
index ae7a5c9598814f37cd487c4f240ee6ad0a717d6a..871a49ed6e73170f70ff088f0bea36d51ce36c76 100755 (executable)
--- a/package/base-files/files/bin/ipcalc.sh
+++ b/package/base-files/files/bin/ipcalc.sh
@@ -96,6 +96,7 @@ echo "COUNT=$count"
 
 # if there's no range, we're done
 [ $# -eq 0 ] && exit 0
+[ -z "$1$2" ] && exit 0
 
 if [ "$prefix" -le 30 ]; then
     lower=$((network + 1))