Patch "dm thin: initialize dm_thin_new_mapping returned by get_next_mapping" has been added to the 3.13-stable tree

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This is a note to let you know that I've just added the patch titled

    dm thin: initialize dm_thin_new_mapping returned by get_next_mapping

to the 3.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dm-thin-initialize-dm_thin_new_mapping-returned-by-get_next_mapping.patch
and it can be found in the queue-3.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 16961b042db8cc5cf75d782b4255193ad56e1d4f Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Tue, 17 Dec 2013 13:19:11 -0500
Subject: dm thin: initialize dm_thin_new_mapping returned by get_next_mapping

From: Mike Snitzer <snitzer@xxxxxxxxxx>

commit 16961b042db8cc5cf75d782b4255193ad56e1d4f upstream.

As additional members are added to the dm_thin_new_mapping structure
care should be taken to make sure they get initialized before use.

Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/md/dm-thin.c |   17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -760,13 +760,17 @@ static int ensure_next_mapping(struct po
 
 static struct dm_thin_new_mapping *get_next_mapping(struct pool *pool)
 {
-	struct dm_thin_new_mapping *r = pool->next_mapping;
+	struct dm_thin_new_mapping *m = pool->next_mapping;
 
 	BUG_ON(!pool->next_mapping);
 
+	memset(m, 0, sizeof(struct dm_thin_new_mapping));
+	INIT_LIST_HEAD(&m->list);
+	m->bio = NULL;
+
 	pool->next_mapping = NULL;
 
-	return r;
+	return m;
 }
 
 static void schedule_copy(struct thin_c *tc, dm_block_t virt_block,
@@ -778,15 +782,10 @@ static void schedule_copy(struct thin_c
 	struct pool *pool = tc->pool;
 	struct dm_thin_new_mapping *m = get_next_mapping(pool);
 
-	INIT_LIST_HEAD(&m->list);
-	m->quiesced = 0;
-	m->prepared = 0;
 	m->tc = tc;
 	m->virt_block = virt_block;
 	m->data_block = data_dest;
 	m->cell = cell;
-	m->err = 0;
-	m->bio = NULL;
 
 	if (!dm_deferred_set_add_work(pool->shared_read_ds, &m->list))
 		m->quiesced = 1;
@@ -849,15 +848,12 @@ static void schedule_zero(struct thin_c
 	struct pool *pool = tc->pool;
 	struct dm_thin_new_mapping *m = get_next_mapping(pool);
 
-	INIT_LIST_HEAD(&m->list);
 	m->quiesced = 1;
 	m->prepared = 0;
 	m->tc = tc;
 	m->virt_block = virt_block;
 	m->data_block = data_block;
 	m->cell = cell;
-	m->err = 0;
-	m->bio = NULL;
 
 	/*
 	 * If the whole block of data is being overwritten or we are not
@@ -1055,7 +1051,6 @@ static void process_discard(struct thin_
 			m->data_block = lookup_result.block;
 			m->cell = cell;
 			m->cell2 = cell2;
-			m->err = 0;
 			m->bio = bio;
 
 			if (!dm_deferred_set_add_work(pool->all_io_ds, &m->list)) {


Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are

queue-3.13/dm-thin-fix-discard-support-to-a-previously-shared-block.patch
queue-3.13/dm-thin-fix-set_pool_mode-exposed-pool-operation-races.patch
queue-3.13/dm-space-map-metadata-fix-extending-the-space-map.patch
queue-3.13/dm-space-map-common-make-sure-new-space-is-used-during-extend.patch
queue-3.13/dm-wait-until-embedded-kobject-is-released-before-destroying-a-device.patch
queue-3.13/dm-thin-initialize-dm_thin_new_mapping-returned-by-get_next_mapping.patch
queue-3.13/dm-space-map-metadata-fix-bug-in-resizing-of-thin-metadata.patch
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