linux-kernel - [PATCH v2 1/6] ufs: ufs_bsg: Remove unnecessary length checkup

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Date:   Sun, 20 Nov 2022 22:59:21 +0100
From:   Bean Huo <beanhuo@...ron.com>
To:     alim.akhtar@...sung.com, avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        daejun7.park@...sung.com, quic_cang@...cinc.com,
        quic_nguyenb@...cinc.com, quic_xiaosenh@...cinc.com,
        quic_richardp@...cinc.com, quic_asutoshd@...cinc.com, hare@...e.de
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/6] ufs: ufs_bsg: Remove unnecessary length checkup

Remove checks on job->request_len and job->reply_len because
The following msgcode checks will rule out malicious requests.

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/ufs/core/ufs_bsg.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c
index b99e3f3dc4ef..9ac8204f1ee6 100644
--- a/drivers/ufs/core/ufs_bsg.c
+++ b/drivers/ufs/core/ufs_bsg.c
@@ -30,21 +30,6 @@ static int ufs_bsg_get_query_desc_size(struct ufs_hba *hba, int *desc_len,
 	return 0;
 }
 
-static int ufs_bsg_verify_query_size(struct ufs_hba *hba,
-				     unsigned int request_len,
-				     unsigned int reply_len)
-{
-	int min_req_len = sizeof(struct ufs_bsg_request);
-	int min_rsp_len = sizeof(struct ufs_bsg_reply);
-
-	if (min_req_len > request_len || min_rsp_len > reply_len) {
-		dev_err(hba->dev, "not enough space assigned\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job,
 				     uint8_t **desc_buff, int *desc_len,
 				     enum query_opcode desc_op)
@@ -88,8 +73,6 @@ static int ufs_bsg_request(struct bsg_job *job)
 	struct ufs_bsg_request *bsg_request = job->request;
 	struct ufs_bsg_reply *bsg_reply = job->reply;
 	struct ufs_hba *hba = shost_priv(dev_to_shost(job->dev->parent));
-	unsigned int req_len = job->request_len;
-	unsigned int reply_len = job->reply_len;
 	struct uic_command uc = {};
 	int msgcode;
 	uint8_t *desc_buff = NULL;
@@ -97,10 +80,6 @@ static int ufs_bsg_request(struct bsg_job *job)
 	enum query_opcode desc_op = UPIU_QUERY_OPCODE_NOP;
 	int ret;
 
-	ret = ufs_bsg_verify_query_size(hba, req_len, reply_len);
-	if (ret)
-		goto out;
-
 	bsg_reply->reply_payload_rcv_len = 0;
 
 	ufshcd_rpm_get_sync(hba);
-- 
2.25.1