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[iproute,v4,3/4] tc/tc_filter: Make sure filter name is not empty

Message ID 20170824094634.4093-4-phil@nwl.cc
State Accepted, archived
Delegated to: stephen hemminger
Headers show

Commit Message

Phil Sutter Aug. 24, 2017, 9:46 a.m. UTC 
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>
---
Changes since v2:
- Instead of calling strlen(), just make sure **argv is not 0.
---
 tc/tc_filter.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index b13fb9185d4fd..cf290ae8e252c 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);