All of lore.kernel.org
 help / color / mirror / Atom feed
From: Dolev Raviv <draviv@codeaurora.org>
To: James.Bottomley@HansenPartnership.com
Cc: linux-scsi@vger.kernel.org, linux-scsi-owner@vger.kernel.org,
	sthumma@codeaurora.org, linux-arm-msm@vger.kernel.org,
	Dolev Raviv <draviv@codeaurora.org>,
	Raviv Shvili <rshvili@codeaurora.org>
Subject: [PATCH V1 2/4] scsi: ufs: device query status and size check
Date: Tue, 27 May 2014 10:21:50 +0300	[thread overview]
Message-ID: <1401175312-17753-3-git-send-email-draviv@codeaurora.org> (raw)
In-Reply-To: <1401175312-17753-1-git-send-email-draviv@codeaurora.org>

Check query response status before copying the response.
Add descriptor query response size check, before copying it to buffer.

Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Raviv Shvili <rshvili@codeaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 49 +++++++++++++++++++++++++++++++----------------
 1 file changed, 32 insertions(+), 17 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ed533f4..f3768ec 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -446,30 +446,34 @@ static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
  * @lrb - pointer to local reference block
  */
 static
-void ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 {
 	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
 
-	/* Get the UPIU response */
-	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
-			UPIU_RSP_CODE_OFFSET;
-
 	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);
 
-
 	/* Get the descriptor */
 	if (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
 		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
 				GENERAL_UPIU_REQUEST_SIZE;
-		u16 len;
+		u16 resp_len;
+		u16 buf_len;
 
 		/* data segment length */
-		len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
+		resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
 						MASK_QUERY_DATA_SEG_LEN;
-
-		memcpy(hba->dev_cmd.query.descriptor, descp,
-				min_t(u16, len, QUERY_DESC_MAX_SIZE));
+		buf_len = hba->dev_cmd.query.request.upiu_req.length;
+		if (likely(buf_len >= resp_len)) {
+			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
+		} else {
+			dev_warn(hba->dev,
+				"%s: Response size is bigger than buffer",
+				__func__);
+			return -EINVAL;
+		}
 	}
+
+	return 0;
 }
 
 /**
@@ -797,11 +801,9 @@ static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
 			QUERY_OSF_SIZE);
 
 	/* Copy the Descriptor */
-	if ((len > 0) && (query->request.upiu_req.opcode ==
-					UPIU_QUERY_OPCODE_WRITE_DESC)) {
-		memcpy(descp, query->descriptor,
-				min_t(u16, len, QUERY_DESC_MAX_SIZE));
-	}
+	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
+		memcpy(descp, query->descriptor, len);
+
 }
 
 static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
@@ -980,6 +982,17 @@ ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
 	return err;
 }
 
+static int
+ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
+{
+	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;
+
+	/* Get the UPIU response */
+	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
+				UPIU_RSP_CODE_OFFSET;
+	return query_res->response;
+}
+
 /**
  * ufshcd_dev_cmd_completion() - handles device management command responses
  * @hba: per adapter instance
@@ -1002,7 +1015,9 @@ ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 		}
 		break;
 	case UPIU_TRANSACTION_QUERY_RSP:
-		ufshcd_copy_query_response(hba, lrbp);
+		err = ufshcd_check_query_response(hba, lrbp);
+		if (!err)
+			err = ufshcd_copy_query_response(hba, lrbp);
 		break;
 	case UPIU_TRANSACTION_REJECT_UPIU:
 		/* TODO: handle Reject UPIU Response */
-- 
1.8.5.2

-- 
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation


  parent reply	other threads:[~2014-05-27  7:21 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-27  7:21 [PATCH V1 0/4] LU queue depth manament Dolev Raviv
2014-05-27  7:21 ` [PATCH V1 1/4] scsi: ufs: query descriptor API Dolev Raviv
2014-06-04  3:31   ` Santosh Y
2014-05-27  7:21 ` Dolev Raviv [this message]
2014-06-04  3:31   ` [PATCH V1 2/4] scsi: ufs: device query status and size check Santosh Y
2014-05-27  7:21 ` [PATCH V1 3/4] scsi: ufs: Logical Unit (LU) command queue depth Dolev Raviv
2014-06-04  3:31   ` Santosh Y
2014-05-27  7:21 ` [PATCH V1 4/4] scsi: ufs: Fix queue depth handling for best effort cases Dolev Raviv
2014-06-04  3:31   ` Santosh Y

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1401175312-17753-3-git-send-email-draviv@codeaurora.org \
    --to=draviv@codeaurora.org \
    --cc=James.Bottomley@HansenPartnership.com \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-scsi-owner@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=rshvili@codeaurora.org \
    --cc=sthumma@codeaurora.org \
    --subject='Re: [PATCH V1 2/4] scsi: ufs: device query status and size check' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.