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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hulk Robot <hulkci@huawei.com>,
        Wang Hai <wanghai38@huawei.com>,
        Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH 5.4 004/158] devlink: Add missing genlmsg_cancel() in devlink_nl_sb_port_pool_fill()
Date:   Mon, 23 Nov 2020 13:20:32 +0100
Message-Id: <20201123121820.159883286@linuxfoundation.org>
In-Reply-To: <20201123121819.943135899@linuxfoundation.org>
References: <20201123121819.943135899@linuxfoundation.org>
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From: Wang Hai <wanghai38@huawei.com>

[ Upstream commit 849920c703392957f94023f77ec89ca6cf119d43 ]

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@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Link: https://lore.kernel.org/r/20201113111622.11040-1-wanghai38@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/devlink.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -1144,7 +1144,7 @@ static int devlink_nl_sb_port_pool_fill(
 		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;
@@ -1157,8 +1157,10 @@ static int devlink_nl_sb_port_pool_fill(
 	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,