netdev - [PATCH v2] iproute2: prevent memory leak

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Date: Wed, 15 Nov 2023 10:37:03 +0800
From: heminhong <heminhong@...inos.cn>
To: stephen@...workplumber.org
Cc: heminhong@...inos.cn,
	netdev@...r.kernel.org
Subject: [PATCH v2] iproute2: prevent memory leak

When the return value of rtnl_talk() is less than 0, 'answer' does not
need to release. When the return value of rtnl_talk() is greater than
or equal to 0, 'answer' will be allocated, if subsequent processing fails,
the memory should be free, otherwise it will cause memory leak.

Signed-off-by: heminhong <heminhong@...inos.cn>
---
 ip/link_gre.c    | 2 ++
 ip/link_gre6.c   | 2 ++
 ip/link_ip6tnl.c | 2 ++
 ip/link_iptnl.c  | 2 ++
 ip/link_vti.c    | 2 ++
 ip/link_vti6.c   | 2 ++
 6 files changed, 12 insertions(+)

diff --git a/ip/link_gre.c b/ip/link_gre.c
index 74a5b5e9..b86ec22d 100644
--- a/ip/link_gre.c
+++ b/ip/link_gre.c
@@ -111,6 +111,8 @@ static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
 
 		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 get_failed:
+			if (answer)
+				free(answer);
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index b03bd65a..72ce148a 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -113,6 +113,8 @@ static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
 
 		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 get_failed:
+			if (answer)
+				free(answer);
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
diff --git a/ip/link_ip6tnl.c b/ip/link_ip6tnl.c
index b27d696f..cffa8345 100644
--- a/ip/link_ip6tnl.c
+++ b/ip/link_ip6tnl.c
@@ -99,6 +99,8 @@ static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv,
 
 		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 get_failed:
+			if (answer)
+				free(answer);
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
diff --git a/ip/link_iptnl.c b/ip/link_iptnl.c
index 1315aebe..b4ffed25 100644
--- a/ip/link_iptnl.c
+++ b/ip/link_iptnl.c
@@ -103,6 +103,8 @@ static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv,
 
 		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 get_failed:
+			if (answer)
+				free(answer);
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
diff --git a/ip/link_vti.c b/ip/link_vti.c
index 50943254..3e4fd95e 100644
--- a/ip/link_vti.c
+++ b/ip/link_vti.c
@@ -67,6 +67,8 @@ static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
 
 		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 get_failed:
+			if (answer)
+				free(answer);
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
diff --git a/ip/link_vti6.c b/ip/link_vti6.c
index 5764221e..e70f5612 100644
--- a/ip/link_vti6.c
+++ b/ip/link_vti6.c
@@ -69,6 +69,8 @@ static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
 
 		if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 get_failed:
+			if (answer)
+				free(answer);
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
 			return -1;
-- 
2.25.1