linux-kernel - [PATCH v2] dpll: Fix potential msg memleak when genlmsg_put

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Message-Id: <20231121013709.73323-1-gehao@kylinos.cn>
Date:   Tue, 21 Nov 2023 09:37:09 +0800
From:   Hao Ge <gehao@...inos.cn>
To:     vadim.fedorenko@...ux.dev, arkadiusz.kubalewski@...el.com
Cc:     jiri@...nulli.us, michal.michalik@...el.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Hao Ge <gehao@...inos.cn>
Subject: [PATCH v2] dpll: Fix potential msg memleak when genlmsg_put_reply failed

We should clean the skb resource if genlmsg_put_reply failed.

Fixes: 9d71b54b65b1 ("dpll: netlink: Add DPLL framework base functions")
Signed-off-by: Hao Ge <gehao@...inos.cn>
---
v1 -> v2: change title due to add some similar fix for some similar cases
---
 drivers/dpll/dpll_netlink.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c
index a6dc3997bf5c..442a0ebeb953 100644
--- a/drivers/dpll/dpll_netlink.c
+++ b/drivers/dpll/dpll_netlink.c
@@ -1093,9 +1093,10 @@ int dpll_nl_pin_id_get_doit(struct sk_buff *skb, struct genl_info *info)
 		return -ENOMEM;
 	hdr = genlmsg_put_reply(msg, info, &dpll_nl_family, 0,
 				DPLL_CMD_PIN_ID_GET);
-	if (!hdr)
+	if (!hdr) {
+		nlmsg_free(msg);
 		return -EMSGSIZE;
-
+	}
 	pin = dpll_pin_find_from_nlattr(info);
 	if (!IS_ERR(pin)) {
 		ret = dpll_msg_add_pin_handle(msg, pin);
@@ -1123,8 +1124,10 @@ int dpll_nl_pin_get_doit(struct sk_buff *skb, struct genl_info *info)
 		return -ENOMEM;
 	hdr = genlmsg_put_reply(msg, info, &dpll_nl_family, 0,
 				DPLL_CMD_PIN_GET);
-	if (!hdr)
+	if (!hdr) {
+		nlmsg_free(msg);
 		return -EMSGSIZE;
+	}
 	ret = dpll_cmd_pin_get_one(msg, pin, info->extack);
 	if (ret) {
 		nlmsg_free(msg);
@@ -1256,8 +1259,10 @@ int dpll_nl_device_id_get_doit(struct sk_buff *skb, struct genl_info *info)
 		return -ENOMEM;
 	hdr = genlmsg_put_reply(msg, info, &dpll_nl_family, 0,
 				DPLL_CMD_DEVICE_ID_GET);
-	if (!hdr)
+	if (!hdr) {
+		nlmsg_free(msg);
 		return -EMSGSIZE;
+	}
 
 	dpll = dpll_device_find_from_nlattr(info);
 	if (!IS_ERR(dpll)) {
@@ -1284,8 +1289,10 @@ int dpll_nl_device_get_doit(struct sk_buff *skb, struct genl_info *info)
 		return -ENOMEM;
 	hdr = genlmsg_put_reply(msg, info, &dpll_nl_family, 0,
 				DPLL_CMD_DEVICE_GET);
-	if (!hdr)
+	if (!hdr) {
+		nlmsg_free(msg);
 		return -EMSGSIZE;
+	}
 
 	ret = dpll_device_get_one(dpll, msg, info->extack);
 	if (ret) {
-- 
2.25.1