lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20160922172941.861460673@linuxfoundation.org>
Date:   Thu, 22 Sep 2016 19:29:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mikulas Patocka <mpatocka@...hat.com>,
        Josef Bacik <jbacik@...com>, Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.4 062/118] dm log writes: move IO accounting earlier to fix error path

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Mikulas Patocka <mpatocka@...hat.com>

commit a5d60783df61fbb67b7596b8a0f6b4b2e05251d5 upstream.

Move log_one_block()'s atomic_inc(&lc->io_blocks) before bio_alloc() to
fix a bug that the target hangs if bio_alloc() fails.  The error path
does put_io_block(lc), so atomic_inc(&lc->io_blocks) must occur before
invoking the error path to avoid underflow of lc->io_blocks.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Reviewed-by: Josef Bacik <jbacik@...com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-log-writes.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -258,12 +258,12 @@ static int log_one_block(struct log_writ
 		goto out;
 	sector++;
 
+	atomic_inc(&lc->io_blocks);
 	bio = bio_alloc(GFP_KERNEL, block->vec_cnt);
 	if (!bio) {
 		DMERR("Couldn't alloc log bio");
 		goto error;
 	}
-	atomic_inc(&lc->io_blocks);
 	bio->bi_iter.bi_size = 0;
 	bio->bi_iter.bi_sector = sector;
 	bio->bi_bdev = lc->logdev->bdev;


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ