[26/38] dm table: avoid crash if integrity profile changes

[Greg KH]

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

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

From: Mike Snitzer <snitzer@xxxxxxxxxx>

commit 876fbba1db4a377f050a2bb49b474c7527b2995d upstream.

Commit a63a5cf (dm: improve block integrity support) introduced a
two-phase initialization of a DM device's integrity profile.  This
patch avoids dereferencing a NULL 'template_disk' pointer in
blk_integrity_register() if there is an integrity profile mismatch in
dm_table_set_integrity().

This can occur if the integrity profiles for stacked devices in a DM
table are changed between the call to dm_table_prealloc_integrity() and
dm_table_set_integrity().

Reported-by: Zdenek Kabelac <zkabelac@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/md/dm-table.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1184,14 +1184,15 @@ static void dm_table_set_integrity(struc
 		return;
 
 	template_disk = dm_table_get_integrity_disk(t, true);
-	if (!template_disk &&
-	    blk_integrity_is_initialized(dm_disk(t->md))) {
+	if (template_disk)
+		blk_integrity_register(dm_disk(t->md),
+				       blk_get_integrity(template_disk));
+	else if (blk_integrity_is_initialized(dm_disk(t->md)))
 		DMWARN("%s: device no longer has a valid integrity profile",
 		       dm_device_name(t->md));
-		return;
-	}
-	blk_integrity_register(dm_disk(t->md),
-			       blk_get_integrity(template_disk));
+	else
+		DMWARN("%s: unable to establish an integrity profile",
+		       dm_device_name(t->md));
 }
 
 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,


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