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| author | Mike Snitzer <snitzer@redhat.com> | 2011-09-26 02:26:17 +0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-09-26 02:26:17 +0400 |
| commit | 876fbba1db4a377f050a2bb49b474c7527b2995d (patch) | |
| tree | df134b1c01cd6385afe7ff7171eb722063de6b4b /drivers/md | |
| parent | 68e58a294fb26f692697179e3f3ecf88dd8cb97c (diff) | |
| download | linux-876fbba1db4a377f050a2bb49b474c7527b2995d.tar.xz | |
dm table: avoid crash if integrity profile changes
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>
Cc: stable@kernel.org # 2.6.39
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-table.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 986b8754bb08..322669807077 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1238,14 +1238,15 @@ 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)); } static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev, |