hptiop: avoid buffer overflow when returning sense data

patch 0fec02c9 in mainline.

avoid buffer overflow when returning sense data.

With current adapter firmware the driver is working but future firmware
updates may return sense data larger than 96 bytes, causing overflow on
scp->sense_buffer and a kernel crash.

This fix should be backported to earlier kernels.
Signed-off-by: HighPoint Linux Team <linux@highpoint-tech.com>
Signed-off-by: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/scsi/hptiop.c

@@ -365,8 +365,9 @@ static void hptiop_host_request_callback(struct hptiop_hba *hba, u32 tag)
 		scp->result = SAM_STAT_CHECK_CONDITION;
 		memset(&scp->sense_buffer,
 				0, sizeof(scp->sense_buffer));
-		memcpy(&scp->sense_buffer,
-			&req->sg_list, le32_to_cpu(req->dataxfer_length));
+		memcpy(&scp->sense_buffer, &req->sg_list,
+				min(sizeof(scp->sense_buffer),
+					le32_to_cpu(req->dataxfer_length)));
 		break;
 
 	default: