From: Phil Sutter <phil@nwl.cc>
Date: Thu, 24 Aug 2017 09:46:33 +0000 (+0200)
Subject: tc/tc_filter: Make sure filter name is not empty
X-Git-Tag: v4.13.0~33
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75716932a0af28da207aa57c212794ab28ce9036;p=thirdparty%2Fiproute2.git

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 b13fb9185..cf290ae8e 100644
--- 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);