tc/tc_filter: Make sure filter name is not empty

The later check for 'k[0] != 0' requires a non-empty filter name,
otherwise NULL pointer dereference in 'q' might happen.

Signed-off-by: Phil Sutter <phil@nwl.cc>

diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index b13fb9185d4fdabe1b49080493419e74dbff70cb..cf290ae8e252c50bbdc5c79ac80f04350ce0faa2 100644 (file)
--- a/tc/tc_filter.c
+++ b/tc/tc_filter.c
@@ -412,6 +412,9 @@ static int tc_filter_get(int cmd, unsigned int flags, int argc, char **argv)
                        usage();
                        return 0;
                } else {
+                       if (!**argv)
+                               invarg("invalid filter name", *argv);
+
                        strncpy(k, *argv, sizeof(k)-1);
 
                        q = get_filter_kind(k);