[PATCH net] devlink: Add missing genlmsg_cancel() in devlink_nl_sb_port_pool_fill()

[Wang Hai]

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@xxxxxxxxxx>
Signed-off-by: Wang Hai <wanghai38@xxxxxxxxxx>
---
 net/core/devlink.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index a932d95be798..83b4e7f51b35 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -1447,8 +1447,10 @@ 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)
+		if (err && err != -EOPNOTSUPP) {
+			genlmsg_cancel(msg, hdr);
 			return err;
+		}
 		if (!err) {
 			if (nla_put_u32(msg, DEVLINK_ATTR_SB_OCC_CUR, cur))
 				goto nla_put_failure;
-- 
2.17.1