[PATCH v3 1/5] blk-iocost: check return value of match_u64()

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

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

Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 block/blk-iocost.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 549ddc9e0c6f..93b938517be3 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3212,7 +3212,8 @@ 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:
-- 
2.31.1