From: Milan Broz <mbroz@redhat.com>
Check that the log bitmap will fit within the log device.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---
drivers/md/dm-log.c | 8 ++++++++
1 files changed, 8 insertions(+)
Index: linux-2.6.28/drivers/md/dm-log.c
===================================================================
--- linux-2.6.28.orig/drivers/md/dm-log.c 2009-01-05 18:18:20.000000000 +0000
+++ linux-2.6.28/drivers/md/dm-log.c 2009-01-05 18:18:22.000000000 +0000
@@ -457,6 +457,14 @@ static int create_log_context(struct dm_
*/
buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
bitset_size, ti->limits.hardsect_size);
+
+ if (buf_size > dev->bdev->bd_inode->i_size) {
+ DMWARN("log device %s too small: need %llu bytes",
+ dev->name, (unsigned long long)buf_size);
+ kfree(lc);
+ return -EINVAL;
+ }
+
lc->header_location.count = buf_size >> SECTOR_SHIFT;
lc->io_req.mem.type = DM_IO_VMA;