linux-kernel - [PATCH][SCSI] fix regression in SCSI_IOCTL_SEND

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Date:	Fri, 22 Aug 2014 15:53:35 -0400
From:	Tony Battersby <tonyb@...ernetics.com>
To:	linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Jens Axboe <axboe@...com>
CC:	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: [PATCH][SCSI] fix regression in SCSI_IOCTL_SEND_COMMAND

blk_rq_set_block_pc() memsets rq->cmd to 0, so it should come
immediately after blk_get_request() to avoid overwriting the
user-supplied CDB.  Also check for failure to allocate rq.

Fixes: f27b087b81b7 ("block: add blk_rq_set_block_pc()")
Cc: <stable@...r.kernel.org> # 3.16.x
Signed-off-by: Tony Battersby <tonyb@...ernetics.com>

---

For inclusion in 3.17 and 3.16.x.

Note: I don't have any programs that use this ioctl, so this patch is
compile-tested only.

--- linux-3.17.0-rc1-a/block/scsi_ioctl.c	2014-08-16 12:40:26.000000000 -0400
+++ linux-3.17.0-rc1-b/block/scsi_ioctl.c	2014-08-22 14:15:34.000000000 -0400
@@ -448,6 +448,11 @@ int sg_scsi_ioctl(struct request_queue *
 	}
 
 	rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
+	if (!rq) {
+		err = -ENOMEM;
+		goto error;
+	}
+	blk_rq_set_block_pc(rq);
 
 	cmdlen = COMMAND_SIZE(opcode);
 
@@ -501,7 +506,6 @@ int sg_scsi_ioctl(struct request_queue *
 	memset(sense, 0, sizeof(sense));
 	rq->sense = sense;
 	rq->sense_len = 0;
-	blk_rq_set_block_pc(rq);
 
 	blk_execute_rq(q, disk, rq, 0);
 
@@ -521,7 +525,8 @@ out:
 	
 error:
 	kfree(buffer);
-	blk_put_request(rq);
+	if (rq)
+		blk_put_request(rq);
 	return err;
 }
 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);

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