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authorMike Snitzer <snitzer@redhat.com>2011-09-25 23:26:17 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-10-16 14:14:53 -0700
commit25dd1546f84a5d5bf85686e36b6d5fb8a4cbcca3 (patch)
tree6ac67a645d42fa2730eb6b8f8a71ea078c5c676c /drivers/md
parent7f3b5ef8184a929f56293d6c7a88f426c7b74558 (diff)
dm table: avoid crash if integrity profile changes
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@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 451c3bb176d2..ebdae6e200c5 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1184,14 +1184,15 @@ static void dm_table_set_integrity(struct dm_table *t)
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,