From ac1f0ac22c7be908fd33407273b9808bfaedada4 Mon Sep 17 00:00:00 2001
From: Milan Broz <mbroz@redhat.com>
Date: Tue, 6 Jan 2009 03:05:02 +0000
Subject: [PATCH] dm log: ensure log bitmap fits on log device
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 file changed, 8 insertions(+)
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 40ed70df673675..737961f275c196 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -457,6 +457,14 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
*/
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;
--
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