linux-kernel - [PATCH] scsi: ufs: Check that space was properly alloced in copy_query

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Message-Id: <1558427062-5084-1-git-send-email-avri.altman@wdc.com>
Date:   Tue, 21 May 2019 11:24:22 +0300
From:   Avri Altman <avri.altman@....com>
To:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Evan Green <evgreen@...omium.org>,
        Bean Huo <beanhuo@...ron.com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        Alim Akhtar <alim.akhtar@...sung.com>
Cc:     Avi Shchislowski <avi.shchislowski@....com>,
        Alex Lemberg <alex.lemberg@....com>,
        Avri Altman <avri.altman@....com>
Subject: [PATCH] scsi: ufs: Check that space was properly alloced in copy_query_response

struct ufs_dev_cmd is the main container that supports device management
commands. In the case of a read descriptor request, we assume that the
proper space was allocated in dev_cmd to hold the returning descriptor.

This is no longer true, as there are flows that doesn't use dev_cmd
for device management requests, and was wrong in the first place.

fixes: d44a5f98bb49 (ufs: query descriptor API)

Signed-off-by: Avri Altman <avri.altman@....com>
---
 drivers/scsi/ufs/ufshcd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 8c1c551..3fe3029 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1917,7 +1917,8 @@ int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 	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) {
+	if (hba->dev_cmd.query.descriptor &&
+	    lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
 		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
 				GENERAL_UPIU_REQUEST_SIZE;
 		u16 resp_len;
-- 
1.9.1