linux-kernel - [PATCH] block: fix bogus EFAULT error from SG

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Message-Id: <1435311886-30834-1-git-send-email-pbonzini@redhat.com>
Date:	Fri, 26 Jun 2015 11:44:46 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH] block: fix bogus EFAULT error from SG_IO ioctl

Whenever blk_fill_sghdr_rq fails, its errno code is ignored and changed to
EFAULT.  This can cause very confusing errors:

  $ sg_persist -k /dev/sda
  persistent reservation in: pass through os error: Bad address

The fix is trivial, just propagate the return value from
blk_fill_sghdr_rq.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 block/scsi_ioctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 55b6f15dac90..dda653ce7b24 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -326,8 +326,8 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 			goto out_put_request;
 	}
 
-	ret = -EFAULT;
-	if (blk_fill_sghdr_rq(q, rq, hdr, mode))
+	ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
+	if (ret < 0)
 		goto out_free_cdb;
 
 	ret = 0;
-- 
2.4.3

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