linux-kernel - [PATCH v2 net] devlink: Add missing genlmsg_cancel() in devlink_nl_sb_port_pool

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Date:   Fri, 13 Nov 2020 19:16:22 +0800
From:   Wang Hai <wanghai38@...wei.com>
To:     <kuba@...nel.org>
CC:     <jiri@...dia.com>, <davem@...emloft.net>, <idosch@...lanox.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 net] devlink: Add missing genlmsg_cancel() in devlink_nl_sb_port_pool_fill()

If sb_occ_port_pool_get() failed in devlink_nl_sb_port_pool_fill(),
msg should be canceled by genlmsg_cancel().

Fixes: df38dafd2559 ("devlink: implement shared buffer occupancy monitoring interface")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
v1->v2: use goto instead of direct return
 net/core/devlink.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index a932d95be798..be8ee96ad188 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -1448,7 +1448,7 @@ static int devlink_nl_sb_port_pool_fill(struct sk_buff *msg,
 		err = ops->sb_occ_port_pool_get(devlink_port, devlink_sb->index,
 						pool_index, &cur, &max);
 		if (err && err != -EOPNOTSUPP)
-			return err;
+			goto sb_occ_get_failure;
 		if (!err) {
 			if (nla_put_u32(msg, DEVLINK_ATTR_SB_OCC_CUR, cur))
 				goto nla_put_failure;
@@ -1461,8 +1461,10 @@ static int devlink_nl_sb_port_pool_fill(struct sk_buff *msg,
 	return 0;
 
 nla_put_failure:
+	err = -EMSGSIZE;
+sb_occ_get_failure:
 	genlmsg_cancel(msg, hdr);
-	return -EMSGSIZE;
+	return err;
 }
 
 static int devlink_nl_cmd_sb_port_pool_get_doit(struct sk_buff *skb,
-- 
2.17.1