From: Milan Broz <mbroz@redhat.com>
Date: Tue, 6 Jan 2009 03:05:02 +0000 (+0000)
Subject: dm log: ensure log bitmap fits on log device
X-Git-Tag: v2.6.29-rc1~492^2~11
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ac1f0ac22c7be908fd33407273b9808bfaedada4;p=linux-2.6-omap-h63xx.git

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>
---

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 40ed70df673..737961f275c 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;