linux-kernel - [PATCH] wd719x: add check for dma mapping errors

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Date:   Sat, 28 Jan 2017 01:30:52 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Ondrej Zary <linux@...nbow-software.org>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] wd719x: add check for dma mapping errors

wd719x_queuecommand() doesn't check if mapping dma memory succeed.
The patch adds the check and failure handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/scsi/wd719x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/wd719x.c b/drivers/scsi/wd719x.c
index 2a9da2e0ea6b..41ddbdcf02e0 100644
--- a/drivers/scsi/wd719x.c
+++ b/drivers/scsi/wd719x.c
@@ -244,6 +244,12 @@ static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
 	scb->sense_buf_length = SCSI_SENSE_BUFFERSIZE;
 	cmd->SCp.dma_handle = dma_map_single(&wd->pdev->dev, cmd->sense_buffer,
 			SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
+	if (dma_mapping_error(&wd->pdev->dev, cmd->SCp.dma_handle)) {
+		dev_err(&wd->pdev->dev, "unable to map dma\n");
+		wd719x_finish_cmd(cmd, DID_ERROR);
+		spin_unlock_irqrestore(wd->sh->host_lock, flags);
+		return 0;
+	}
 	scb->sense_buf = cpu_to_le32(cmd->SCp.dma_handle);
 
 	/* request autosense */
-- 
2.7.4