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| author | Heinz Mauelshagen <heinzm@redhat.com> | 2014-10-29 19:02:27 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2014-10-29 14:53:27 -0400 |
| commit | d20c4b08be822ab1c5d333297f38f1b532d3febc (patch) | |
| tree | 82de1747b623d3d37a59b07762fd473c0c2501e6 | |
| parent | 40d43c4b4cac4c2647bf07110d7b07d35f399a84 (diff) | |
| download | linux-d20c4b08be822ab1c5d333297f38f1b532d3febc.tar.gz linux-d20c4b08be822ab1c5d333297f38f1b532d3febc.tar.bz2 linux-d20c4b08be822ab1c5d333297f38f1b532d3febc.zip | |
dm raid: fix inaccessible superblocks causing oops in configure_discard_support
Commit 48cf06bc5f ("dm raid: add discard support for RAID levels 4, 5
and 6") did not properly handle missing metadata device(s). A failing
read of the superblock causes the metadata and data devices to be
removed from the dev array in struct raid_set, setting references to
both devices to NULL. configure_discard_support() nonetheless tries to
access the data dev unconditionally causing an oops.
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
| -rw-r--r-- | drivers/md/dm-raid.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index a7cb9dd5f135..07c0fa0fa284 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -1172,8 +1172,12 @@ static void configure_discard_support(struct dm_target *ti, struct raid_set *rs) raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); for (i = 0; i < rs->md.raid_disks; i++) { - struct request_queue *q = bdev_get_queue(rs->dev[i].rdev.bdev); + struct request_queue *q; + if (!rs->dev[i].rdev.bdev) + continue; + + q = bdev_get_queue(rs->dev[i].rdev.bdev); if (!q || !blk_queue_discard(q)) return; |