blk-iocost: check return value of match_u64()

This patch fixs that the return value of match_u64() from ioc_qos_write()
is not checked,

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230117070806.3857142-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index b691b6b..3b99c6a 100644 (file)
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3214,7 +3214,8 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
 
                switch (match_token(p, qos_ctrl_tokens, args)) {
                case QOS_ENABLE:
-                       match_u64(&args[0], &v);
+                       if (match_u64(&args[0], &v))
+                               goto einval;
                        enable = v;
                        continue;
                case QOS_CTRL: