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Subject[patch 07/24] dm crypt: Fix data corruption with dm-crypt over RAID5
2.6.18-stable review patch.  If anyone has any objections, please let us know.
------------------
From: Christophe Saout <christophe@saout.de>

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@saout.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
drivers/md/dm-crypt.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- linux-2.6.18.5.orig/drivers/md/dm-crypt.c
+++ linux-2.6.18.5/drivers/md/dm-crypt.c
@@ -717,13 +717,15 @@ static int crypt_endio(struct bio *bio,
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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