netdev - [iproute PATCH] tc: don't accept qdisc 'handle' greater than ffff

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Date:   Fri, 16 Sep 2016 10:30:00 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Phil Sutter <phil@....cc>, Hangbin Liu <liuhangbin@...il.com>
Subject: [iproute PATCH] tc: don't accept qdisc 'handle' greater than ffff

since get_qdisc_handle() truncates the input value to 16 bit, return an
error and prompt "invalid qdisc ID" in case input 'handle' parameter needs
more than 16 bit to be stored.

Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 tc/tc_util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tc/tc_util.c b/tc/tc_util.c
index 15e49b7..24ca1f1 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -82,7 +82,7 @@ int get_qdisc_handle(__u32 *h, const char *str)
 	if (strcmp(str, "none") == 0)
 		goto ok;
 	maj = strtoul(str, &p, 16);
-	if (p == str)
+	if (p == str || maj >= (1 << 16))
 		return -1;
 	maj <<= 16;
 	if (*p != ':' && *p != 0)
-- 
2.5.5