diff options
| author |   NeilBrown <neilb@suse.de> | 2008-03-04 14:29:31 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-03-04 16:35:17 -0800 |
| commit | a1801f858e57f87a7f79914346921cc729632295 (patch) | |
| tree | 1ac8c153af0512382c387316a6882df555eb721e | |
| parent | md: reduce CPU wastage on idle md array with a write-intent bitmap (diff) | |
| download | linux-dev-a1801f858e57f87a7f79914346921cc729632295.tar.xz linux-dev-a1801f858e57f87a7f79914346921cc729632295.zip | |
md: guard against possible bad array geometry in v1 metadata
Make sure the data doesn't start before the end of the superblock when the
superblock is at the start of the device.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/md/md.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 7da6ec244e15..b375de5c1af2 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1105,7 +1105,11 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; if (rdev->sb_size & bmask) - rdev-> sb_size = (rdev->sb_size | bmask)+1; + rdev->sb_size = (rdev->sb_size | bmask) + 1; + + if (minor_version + && rdev->data_offset < sb_offset + (rdev->sb_size/512)) + return -EINVAL; if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) rdev->desc_nr = -1; @@ -1137,7 +1141,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) else ret = 0; } - if (minor_version) + if (minor_version) rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; else rdev->size = rdev->sb_offset; |