netdev - [PATCH ethtool 2/2] netlink: fix leaked instances of struct nl

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Date:   Mon,  9 Nov 2020 13:30:57 +0100 (CET)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Ido Schimmel <idosch@...sch.org>, Ivan Vecera <ivecera@...hat.com>
Subject: [PATCH ethtool 2/2] netlink: fix leaked instances of struct nl_socket

Valgrind detected memory leaks caused by missing cleanup of netlink
context's ethnl_socket, ethnl2_socket and rtnl_socket. Also, contrary to
its description, nlsock_done() does not free struct nl_socket itself.
Fix nlsock_done() to free the structure and use it to dispose of sockets
pointed to by struct nl_context members.

Fixes: 50efb3cdd2bb ("netlink: netlink socket wrapper and helpers")
Fixes: 87307c30724d ("netlink: initialize ethtool netlink socket")
Fixes: 7f3585b22a4b ("netlink: add handler for permaddr (-P)")
Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 netlink/netlink.c | 11 ++++++++---
 netlink/nlsock.c  |  3 +++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/netlink/netlink.c b/netlink/netlink.c
index aaaabdd3048e..ffe06339f099 100644
--- a/netlink/netlink.c
+++ b/netlink/netlink.c
@@ -435,11 +435,16 @@ out_free:
 
 static void netlink_done(struct cmd_context *ctx)
 {
-	if (!ctx->nlctx)
+	struct nl_context *nlctx = ctx->nlctx;
+
+	if (!nlctx)
 		return;
 
-	free(ctx->nlctx->ops_info);
-	free(ctx->nlctx);
+	nlsock_done(nlctx->ethnl_socket);
+	nlsock_done(nlctx->ethnl2_socket);
+	nlsock_done(nlctx->rtnl_socket);
+	free(nlctx->ops_info);
+	free(nlctx);
 	ctx->nlctx = NULL;
 	cleanup_all_strings();
 }
diff --git a/netlink/nlsock.c b/netlink/nlsock.c
index ef31d8c33b29..0ec2738d81d2 100644
--- a/netlink/nlsock.c
+++ b/netlink/nlsock.c
@@ -395,8 +395,11 @@ out_msgbuff:
  */
 void nlsock_done(struct nl_socket *nlsk)
 {
+	if (!nlsk)
+		return;
 	if (nlsk->sk)
 		mnl_socket_close(nlsk->sk);
 	msgbuff_done(&nlsk->msgbuff);
 	memset(nlsk, '\0', sizeof(*nlsk));
+	free(nlsk);
 }
-- 
2.29.2