netdev - [PATCH v3] iproute2: prevent memory leak

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Message-Id: <20231115075650.33219-1-heminhong@kylinos.cn>
Date: Wed, 15 Nov 2023 15:56:50 +0800
From: heminhong <heminhong@...inos.cn>
To: stephen@...workplumber.org
Cc: heminhong@...inos.cn,
	netdev@...r.kernel.org
Subject: [PATCH v3] iproute2: prevent memory leak

When the return value of rtnl_talk() is greater than
or equal to 0, 'answer' will be allocated.
The 'answer' should be free after using,
otherwise it will cause memory leak.

Signed-off-by: heminhong <heminhong@...inos.cn>
---
 ip/link_gre.c    | 1 +
 ip/link_gre6.c   | 1 +
 ip/link_ip6tnl.c | 1 +
 ip/link_iptnl.c  | 1 +
 ip/link_vti.c    | 1 +
 ip/link_vti6.c   | 1 +
 6 files changed, 6 insertions(+)

diff --git a/ip/link_gre.c b/ip/link_gre.c
index 74a5b5e9..3d3fcbae 100644
--- a/ip/link_gre.c
+++ b/ip/link_gre.c
@@ -113,6 +113,7 @@ static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
+			free(answer);
 			return -1;
 		}
 
diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index b03bd65a..d74472d2 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -115,6 +115,7 @@ static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
+			free(answer);
 			return -1;
 		}
 
diff --git a/ip/link_ip6tnl.c b/ip/link_ip6tnl.c
index b27d696f..8498b726 100644
--- a/ip/link_ip6tnl.c
+++ b/ip/link_ip6tnl.c
@@ -101,6 +101,7 @@ static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv,
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
+			free(answer);
 			return -1;
 		}
 
diff --git a/ip/link_iptnl.c b/ip/link_iptnl.c
index 1315aebe..2ee4011d 100644
--- a/ip/link_iptnl.c
+++ b/ip/link_iptnl.c
@@ -105,6 +105,7 @@ static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv,
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
+			free(answer);
 			return -1;
 		}
 
diff --git a/ip/link_vti.c b/ip/link_vti.c
index 50943254..dbbfcb2b 100644
--- a/ip/link_vti.c
+++ b/ip/link_vti.c
@@ -69,6 +69,7 @@ static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
+			free(answer);
 			return -1;
 		}
 
diff --git a/ip/link_vti6.c b/ip/link_vti6.c
index 5764221e..096759e6 100644
--- a/ip/link_vti6.c
+++ b/ip/link_vti6.c
@@ -71,6 +71,7 @@ static int vti6_parse_opt(struct link_util *lu, int argc, char **argv,
 get_failed:
 			fprintf(stderr,
 				"Failed to get existing tunnel info.\n");
+			free(answer);
 			return -1;
 		}
 
-- 
2.25.1