linux-kernel - [stable][PATCH < 2.6.19] Fix data corruption with dm-crypt over RAID5

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Message-Id: <1165026476.29307.23.camel@leto.intern.saout.de>
Date:	Sat, 02 Dec 2006 03:27:56 +0100
From:	Christophe Saout <christophe@...ut.de>
To:	linux-kernel@...r.kernel.org
Cc:	dm-crypt@...ut.de, Andrey <dm-crypt-revealed-address@...ik.org>,
	Andrew Morton <akpm@...l.org>, agk@...hat.com,
	Neil Brown <neilb@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: [stable][PATCH < 2.6.19] Fix data corruption with dm-crypt over
	RAID5

Fix corruption issue with dm-crypt on top of software raid5. Cancelled
readahead bio's that report no error, just have BIO_UPTODATE cleared
were reported as successful reads to the higher layers (and leaving
random content in the buffer cache). Already fixed in 2.6.19.

Signed-off-by: Christophe Saout <christophe@...ut.de>


--- linux-2.6.18.orig/drivers/md/dm-crypt.c	2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6.18/drivers/md/dm-crypt.c	2006-12-02 03:03:36.000000000 +0100
@@ -717,13 +717,15 @@
 	if (bio->bi_size)
 		return 1;
 
+	if (!bio_flagged(bio, BIO_UPTODATE) && !error)
+		error = -EIO;
+                        
 	bio_put(bio);
 
 	/*
 	 * successful reads are decrypted by the worker thread
 	 */
-	if ((bio_data_dir(bio) == READ)
-	    && bio_flagged(bio, BIO_UPTODATE)) {
+	if (bio_data_dir(io->bio) == READ && !error) {
 		kcryptd_queue_io(io);
 		return 0;
 	}


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