netdev - [iproute PATCH] ipaddress: Fix segfault in 'addr showdump'

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Message-Id: <20170912145812.15380-1-phil@nwl.cc>
Date:   Tue, 12 Sep 2017 16:58:12 +0200
From:   Phil Sutter <phil@....cc>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, Hangbin Liu <liuhangbin@...il.com>
Subject: [iproute PATCH] ipaddress: Fix segfault in 'addr showdump'

Obviously, 'addr showdump' feature wasn't adjusted to json output
support. As a consequence, calls to print_string() in print_addrinfo()
tried to dereference a NULL FILE pointer.

Fixes: d0e720111aad2 ("ip: ipaddress.c: add support for json output")
Signed-off-by: Phil Sutter <phil@....cc>
---
 ip/ipaddress.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 9797145023966..ee6c9f588e7ba 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -1801,17 +1801,31 @@ static int show_handler(const struct sockaddr_nl *nl,
 {
 	struct ifaddrmsg *ifa = NLMSG_DATA(n);
 
-	printf("if%d:\n", ifa->ifa_index);
+	open_json_object(NULL);
+	print_int(PRINT_ANY, "index", "if%d:\n", ifa->ifa_index);
 	print_addrinfo(NULL, n, stdout);
+	close_json_object();
 	return 0;
 }
 
 static int ipaddr_showdump(void)
 {
+	int err;
+
 	if (ipadd_dump_check_magic())
 		exit(-1);
 
-	exit(rtnl_from_file(stdin, &show_handler, NULL));
+	new_json_obj(json, stdout);
+	open_json_object(NULL);
+	open_json_array(PRINT_JSON, "addr_info");
+
+	err = rtnl_from_file(stdin, &show_handler, NULL);
+
+	close_json_array(PRINT_JSON, NULL);
+	close_json_object();
+	delete_json_obj();
+
+	exit(err);
 }
 
 static int restore_handler(const struct sockaddr_nl *nl,
-- 
2.13.1