105 lines
2.7 KiB
Diff
105 lines
2.7 KiB
Diff
From 9cfbfd6b5b3aa49b3966853d06fb3ddae82e207e Mon Sep 17 00:00:00 2001
|
|
From: Lukasz Czapnik <lukasz.czapnik@gmail.com>
|
|
Date: Mon, 27 May 2019 23:03:49 +0200
|
|
Subject: [PATCH] tc: flower: fix port value truncation
|
|
|
|
sscanf truncates read port values silently without any error. As sscanf
|
|
man says:
|
|
(...) sscanf() conform to C89 and C99 and POSIX.1-2001. These standards
|
|
do not specify the ERANGE error.
|
|
|
|
Replace sscanf with safer get_be16 that returns error when value is out
|
|
of range.
|
|
|
|
Example:
|
|
tc filter add dev eth0 protocol ip parent ffff: prio 1 flower ip_proto
|
|
tcp dst_port 70000 hw_tc 1
|
|
|
|
Would result in filter for port 4464 without any warning.
|
|
|
|
Fixes: 8930840e678b ("tc: flower: Classify packets based port ranges")
|
|
Signed-off-by: Lukasz Czapnik <lukasz.czapnik@intel.com>
|
|
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
|
|
(cherry picked from commit 767b6fd620ddc4319a121595f953313b2e9789ff)
|
|
Signed-off-by: Phil Sutter <psutter@redhat.com>
|
|
---
|
|
tc/f_flower.c | 48 ++++++++++++++++++++++++++++++++++++------------
|
|
1 file changed, 36 insertions(+), 12 deletions(-)
|
|
|
|
diff --git a/tc/f_flower.c b/tc/f_flower.c
|
|
index 9659e894dd1f9..e2420d924248d 100644
|
|
--- a/tc/f_flower.c
|
|
+++ b/tc/f_flower.c
|
|
@@ -493,23 +493,40 @@ static int flower_port_range_attr_type(__u8 ip_proto, enum flower_endpoint type,
|
|
return 0;
|
|
}
|
|
|
|
+/* parse range args in format 10-20 */
|
|
+static int parse_range(char *str, __be16 *min, __be16 *max)
|
|
+{
|
|
+ char *sep;
|
|
+
|
|
+ sep = strchr(str, '-');
|
|
+ if (sep) {
|
|
+ *sep = '\0';
|
|
+
|
|
+ if (get_be16(min, str, 10))
|
|
+ return -1;
|
|
+
|
|
+ if (get_be16(max, sep + 1, 10))
|
|
+ return -1;
|
|
+ } else {
|
|
+ if (get_be16(min, str, 10))
|
|
+ return -1;
|
|
+ }
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int flower_parse_port(char *str, __u8 ip_proto,
|
|
enum flower_endpoint endpoint,
|
|
struct nlmsghdr *n)
|
|
{
|
|
- __u16 min, max;
|
|
+ __be16 min = 0;
|
|
+ __be16 max = 0;
|
|
int ret;
|
|
|
|
- ret = sscanf(str, "%hu-%hu", &min, &max);
|
|
-
|
|
- if (ret == 1) {
|
|
- int type;
|
|
+ ret = parse_range(str, &min, &max);
|
|
+ if (ret)
|
|
+ return -1;
|
|
|
|
- type = flower_port_attr_type(ip_proto, endpoint);
|
|
- if (type < 0)
|
|
- return -1;
|
|
- addattr16(n, MAX_MSG, type, htons(min));
|
|
- } else if (ret == 2) {
|
|
+ if (min && max) {
|
|
__be16 min_port_type, max_port_type;
|
|
|
|
if (max <= min) {
|
|
@@ -520,8 +537,15 @@ static int flower_parse_port(char *str, __u8 ip_proto,
|
|
&min_port_type, &max_port_type))
|
|
return -1;
|
|
|
|
- addattr16(n, MAX_MSG, min_port_type, htons(min));
|
|
- addattr16(n, MAX_MSG, max_port_type, htons(max));
|
|
+ addattr16(n, MAX_MSG, min_port_type, min);
|
|
+ addattr16(n, MAX_MSG, max_port_type, max);
|
|
+ } else if (min && !max) {
|
|
+ int type;
|
|
+
|
|
+ type = flower_port_attr_type(ip_proto, endpoint);
|
|
+ if (type < 0)
|
|
+ return -1;
|
|
+ addattr16(n, MAX_MSG, type, min);
|
|
} else {
|
|
return -1;
|
|
}
|
|
--
|
|
2.21.0
|
|
|