netdev - [PATCH iproute2-next v3 08/11] lib: parse_mapping: Update argc, argv on error

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Date:   Sun,  8 Nov 2020 16:07:29 +0100
From:   Petr Machata <me@...chata.org>
To:     netdev@...r.kernel.org, dsahern@...il.com,
        stephen@...workplumber.org
Cc:     john.fastabend@...il.com, jiri@...dia.com, idosch@...dia.com,
        Jakub Kicinski <kuba@...nel.org>,
        Roman Mashak <mrv@...atatu.com>,
        Leon Romanovsky <leon@...nel.org>,
        Petr Machata <me@...chata.org>
Subject: [PATCH iproute2-next v3 08/11] lib: parse_mapping: Update argc, argv on error

Currently argc and argv are not updated unless parsing of all of the
mapping was successful. However in that case, "ip link" will point at the
wrong argument when complaining:

    # ip link add name eth0.100 link eth0 type vlan id 100 egress 1:1 2:foo
    Error: argument "1" is wrong: invalid egress-qos-map

Update argc and argv even in the case of parsing error, so that the right
element is indicated.

Signed-off-by: Petr Machata <me@...chata.org>
---
 lib/utils.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/lib/utils.c b/lib/utils.c
index 1dfaaf564915..67d64df7e3e6 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -1770,6 +1770,7 @@ int parse_mapping(int *argcp, char ***argvp,
 {
 	int argc = *argcp;
 	char **argv = *argvp;
+	int ret = 0;
 
 	while (argc > 0) {
 		char *colon = strchr(*argv, ':');
@@ -1779,15 +1780,19 @@ int parse_mapping(int *argcp, char ***argvp,
 			break;
 		*colon = '\0';
 
-		if (get_u32(&key, *argv, 0))
-			return 1;
-		if (mapping_cb(key, colon + 1, mapping_cb_data))
-			return 1;
+		if (get_u32(&key, *argv, 0)) {
+			ret = 1;
+			break;
+		}
+		if (mapping_cb(key, colon + 1, mapping_cb_data)) {
+			ret = 1;
+			break;
+		}
 
 		argc--, argv++;
 	}
 
 	*argcp = argc;
 	*argvp = argv;
-	return 0;
+	return ret;
 }
-- 
2.25.1