linux-kernel - [004/127] block: check for proper length of iov entries in blk_rq_map_user

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Message-Id: <20101208004424.803960336@clark.site>
Date:	Tue, 07 Dec 2010 16:43:10 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jens Axboe <jaxboe@...ionio.com>
Subject: [004/127] block: check for proper length of iov entries in blk_rq_map_user_iov()

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jens Axboe <jaxboe@...ionio.com>

commit 9284bcf4e335e5f18a8bc7b26461c33ab60d0689 upstream.

Ensure that we pass down properly validated iov segments before
calling into the mapping or copy functions.

Reported-by: Dan Rosenberg <drosenberg@...curity.com>
Signed-off-by: Jens Axboe <jaxboe@...ionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 block/blk-map.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -205,6 +205,8 @@ int blk_rq_map_user_iov(struct request_q
 			unaligned = 1;
 			break;
 		}
+		if (!iov[i].iov_len)
+			return -EINVAL;
 	}
 
 	if (unaligned || (q->dma_pad_mask & len) || map_data)


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